Wednesday, November 3, 2010

All About Roses

All About
Roses



A rose is a perennial flower shrub or vine of the genus Rosa, within the family Rosaceae, that contains over 100 species and comes in a variety of colours. The species form a group of erect shrubs, and climbing or trailing plants, with stems that are often armed with sharp prickles. Most are native to Asia, with smaller numbers of species native to Europe, North America, and northwest Africa. Natives, cultivars and hybrids are all widely grown for their beauty and fragrance.[1]
The leaves are alternate and pinnately compound, with sharply toothed oval-shaped leaflets. The plant's fleshy edible fruit, which ripens in the late summer through autumn, is called a rose hip. Rose plants range in size from compact, miniature roses, to climbers that can reach 7 meters in height. Species from different parts of the world easily hybridize, which has given rise to the many types of garden roses.
The name rose comes from French, itself from Latin, rosa, which was borrowed from Oscan, from Greek ρόδιόν rhodion (Aeolic υρόδιόν wrodion), from Old Persian wurdi "flower" (cf. Avest. warda, Sogdian ward, Parthian wâr).[2][3]
Attar of rose is the steam-extracted essential oil from rose flowers that has been used in perfumes for centuries. Rose water, made from the rose oil, is widely used in Asian and Middle Eastern cuisine. The French are known for their rose syrup, most commonly made from an extract of rose petals. In the United States, this French rose syrup is used to make rose scones and marshmallows.
Rose hips are occasionally made into jam, jelly, and marmalade, or are brewed for tea, primarily for their high vitamin C content. They are also pressed and filtered to make rose hip syrup. Rose hips are also used to produce Rose hip seed oil, which is used in skin products and some makeup products.

Botany


Rose leaflets

The leaves of most species are 5–15 centimetres long, pinnate, with (3–) 5–9 (–13) leaflets and basal stipules; the leaflets usually have a serrated margin, and often a few small prickles on the underside of the stem. The vast majority of roses are deciduous but a few (particularly in South east Asia) are evergreen or nearly so.
The flowers of most species of roses have five petals, with the exception of Rosa sericea, which usually has only four. Each petal is divided into two distinct lobes and is usually white or pink, though in a few species yellow or red. Beneath the petals are five sepals (or in the case of some Rosa sericea, four). These may be long enough to be visible when viewed from above and appear as green points alternating with the rounded petals. The ovary is inferior, developing below the petals and sepals.

Rosa canina hips

The aggregate fruit of the rose is a berry-like structure called a rose hip. Rose species that produce open-faced flowers are attractive to pollinating bees and other insects, thus more apt to produce hips. Many of the domestic cultivars are so tightly petalled that they do not provide access for pollination. The hips of most species are red, but a few (e.g. Rosa pimpinellifolia) have dark purple to black hips. Each hip comprises an outer fleshy layer, the hypanthium, which contains 5–160 "seeds" (technically dry single-seeded fruits called achenes) embedded in a matrix of fine, but stiff, hairs. Rose hips of some species, especially the Dog Rose (Rosa canina) and Rugosa Rose (Rosa rugosa), are very rich in vitamin C, among the richest sources of any plant. The hips are eaten by fruit-eating birds such as thrushes and waxwings, which then disperse the seeds in their droppings. Some birds, particularly finches, also eat the seeds.

 
Rose thorns are actually prickles - outgrowths of the epidermis.

While the sharp objects along a rose stem are commonly called "thorns", they are actually prickles[citation needed] — outgrowths of the epidermis (the outer layer of tissue of the stem). True thorns, as produced by e.g. Citrus or Pyracantha, are modified stems, which always originate at a node and which have nodes and internodes along the length of the thorn itself. Rose prickles are typically sickle-shaped hooks, which aid the rose in hanging onto other vegetation when growing over it. Some species such as Rosa rugosa and R. pimpinellifolia have densely packed straight spines, probably an adaptation to reduce browsing by animals, but also possibly an adaptation to trap wind-blown sand and so reduce erosion and protect their roots (both of these species grow naturally on coastal sand dunes). Despite the presence of prickles, roses are frequently browsed by deer. A few species of roses only have vestigial prickles that have no points.
Species
Further information: List of Rosa species
Some representative rose species

Cultivation

 

 File:Rose-picking in Bulgaria 1870ies.jpg

Rose-picking in Bulgaria 1870ies.jpg

In horticulture roses are propagated by grafting or rooting cuttings. Cultivars are selected for their flowers, growth habit, cold and/or disease resistance, and many other factors. They may be grafted onto a rootstock that provides sturdiness, or (especially with Old Garden Roses) allowed to develop their own roots. Roses require 5 hours of direct sunlight a day during the growing season. Following blooming and exposure to frost roses enter a dormant stage in winter.
Many thousands of rose hybrids and cultivars have been bred and selected for garden use; most are double-flowered with many or all of the stamens having mutated into additional petals. In the early 19th century the Empress Josephine of France patronized the development of rose breeding at her gardens at Malmaison. As long ago as 1840 a collection numbering over one thousand different cultivars, varieties and species was possible when a rosarium was planted by Loddiges nursery for Abney Park Cemetery, an early Victorian garden cemetery and arboretum in England.
20th-century rose breeders generally emphasized size and colour, producing large, attractive blooms with little or no scent. Many wild and "old-fashioned" roses, by contrast, have a strong sweet scent.
Roses thrive in temperate climates. Those based on Asian species do well in their native sub-tropical environments. Certain species and cultivars can even flourish in tropical climates, especially when grafted onto appropriate rootstocks.
There is no single system of classification for garden roses. In general, however, roses are placed in one of three main groups: Wild, Old Garden, and Modern Garden roses.

Wild Roses

The wild roses include the species listed above and some of their hybrids. Species roses commonly grown in gardens include Rosa moschata, the Musk Rose; Rosa banksiae, Lady Banks' Rose; Rosa pimpinellifolia, the Scots or Burnet Rose; Rosa rubiginosa, the Sweetbriar or Eglantine; and Rosa foetida, in varieties Austrian Copper, Persian Double and Harison's Yellow.

Old Garden Roses

An Old Garden Rose is defined as any rose belonging to a class which existed before the introduction of the first Modern Rose, La France, in 1867. In general, Old Garden Roses of European or Mediterranean origin are once-blooming woody shrubs, with notably fragrant, double-flowered blooms primarily in shades of white, pink and red. The shrubs' foliage tends to be highly disease-resistant, and they generally bloom only on two-year-old canes. The introduction of China and Tea roses from East Asia around 1800 led to new classes of Old Garden Roses which bloom on new growth, often repeatedly from spring to fall. Most Old Garden Roses are classified into one of the following groups.
'Maiden's Blush', an Alba rose (before 1400)



Alba
Literally "white roses", derived from R. arvensis and the closely allied R. alba. These are some of the oldest garden roses, probably brought to Great Britain by the Romans. The shrubs flower once yearly in the spring with blossoms of white or pale pink. The shrubs frequently feature gray-green foliage and a climbing habit of growth . Examples: 'Alba Semiplena', 'White Rose of York'.

 

Gallica

Gallica rose 'Charles de Mills', before 1790
The gallica or Provins roses are a very old class developed from R. gallica, which is a native of central and southern Europe. The Apothecary's Rose, R. gallica officinalis, was grown in monastic herbiaries in the Middle Ages, and became famous in English history as the Red Rose of Lancaster. Gallicas flower once in the summer over low shrubs rarely over 4' tall. Unlike most other once-blooming Old Garden Roses, the gallica class includes shades of red, maroon and deep purplish crimson. Examples: 'Cardinal de Richelieu', 'Charles de Mills', 'Rosa Mundi' (R. gallica versicolour).
'Autumn Damask' ('Quatre Saisons')

 

Damask

Named for Damascus in Syria, damasks originated in ancient times with a natural cross of (Rosa moschata x Rosa gallica) x Rosa fedtschenkoana.[4] Robert de Brie is given credit for bringing damask roses from the Middle East to Europe sometime between 1254 and 1276, although there is evidence from ancient Roman frescoes that at least one damask rose existed in Europe for hundreds of years prior. Summer damasks bloom once in summer. Autumn or Four Seasons damasks bloom again later, in the fall: the only remontant Old European roses. Shrubs tend to have rangy to sprawly growth habits and vicious thorns. The flowers typically have a more loose petal formation than gallicas, as well as a stronger, tangy fragrance. Examples: 'Ispahan', 'Madame Hardy'.

Centifolia or Provence

Centifolia roses, raised in the 17th century in the Netherlands, are named for their "one hundred" petals; they are often called "cabbage" roses due to the globular shape of the flowers. The result of damask roses crossed with albas, the centifolias are all once-flowering. As a class, they are notable for their inclination to produce mutations of various sizes and forms, including moss roses and some of the first miniature roses (see below) . Examples: 'Centifolia', 'Paul Ricault'.

Moss

Mutations of primarily centifolia roses (or sometimes damasks), moss roses have a mossy excrescence on the stems and sepals that often emits a pleasant woodsy or balsam scent when rubbed. Moss roses are cherished for this unique trait, but as a group they have contributed nothing to the development of new rose classifications. Moss roses with centifolia background are once-flowering; some moss roses exhibit repeat-blooming, indicative of Autumn Damask parentage. Example: 'Common Moss' (centifolia-moss), 'Alfred de Dalmas' (Autumn Damask moss).

Portland

The Portland roses were long thought to be the first group of crosses between China roses and European roses; recent DNA analysis at the University of Lyons, however, has demonstrated that the original Portland Rose has no Chinese ancestry, but rather represents an autumn damask/gallica lineage.[5] They were named after the Duchess of Portland who received (from Italy about 1775) a rose then known as R. paestana or 'Scarlet Four Seasons' Rose' (now known simply as 'The Portland Rose'). The whole class of Portland roses was thence developed from that one rose. The first repeat-flowering class of rose with fancy European-style blossoms, the plants tend to be fairly short and shrubby, with proportionately short flower stalks. Example: 'James Veitch', 'Rose de Rescht', 'Comte de Chambord'.

 

China

'Parson's Pink China' or 'Old Blush,' one of the "stud Chinas"
The China roses, based on Rosa chinensis, were cultivated in East Asia for centuries and finally reached Western Europe in the late 18th century. They are the parents of many of today's hybrid roses,[6] and they brought a change to the form of the flower.[7] Compared with the aforementioned European rose classes, the Chinese roses had less fragrant, smaller blooms carried over twiggier, more cold-sensitive shrubs. Yet they possessed the amazing ability to bloom repeatedly throughout the summer and into late autumn, unlike their European counterparts. The flowers of China roses were also notable for their tendency to "suntan," or darken over time — unlike the blooms of European roses, which tended to fade after opening.[7] This made them highly desirable for hybridisation purposes in the early 19th century. According to Graham Stuart Thomas, China Roses are the class upon which modern roses are built.[7] Today's exhibition rose owes its form to the China genes, and the China Roses also brought slender buds which unfurl when opening.[7] Tradition holds that four "stud China" roses ('Slater's Crimson China' (1792), 'Parsons' Pink China' (1793), and the Tea roses 'Hume's Blush Tea-scented China' (1809) and 'Parks' Yellow Tea-Scented China' (1824)) were brought to Europe in the late eighteenth and early 19th centuries; in fact there were rather more, at least five Chinas not counting the Teas having been imported.[8] This brought about the creation of the first classes of repeat-flowering Old Garden Roses, and later the Modern Garden Roses. Examples: 'Old Blush China', 'Mutabilis' (Butterfly Rose), 'Cramoisie Superieur'.
Tea rose 'Mrs Dudley Cross' (Paul 1907)

 

Tea

The original "Tea-scented Chinas" (Rosa x odorata) were Oriental cultivars thought to represent hybrids of R. chinensis with R. gigantea, a large Asian climbing rose with pale-yellow blossoms. Immediately upon their introduction in the early 19th century breeders went to work with them, especially in France, crossing them first with Chinas and then with Bourbons and Noisettes. The Teas are repeat-flowering roses, named for their fragrance being reminiscent of Chinese black tea (although this is not always the case). The colour range includes pastel shades of white, pink and (a novelty at the time) yellow to apricot. The individual flowers of many cultivars are semi-pendent and nodding, due to weak flower stalks. In a "typical" Tea, pointed buds produce high-centred blooms which unfurl in a spiral fashion, and the petals tend to roll back at the edges, producing a petal with a pointed tip; the Teas are thus the originators of today's "classic" florists' rose form. According to rose historian Brent Dickerson, the Tea classification owes as much to marketing as to botany; 19th century nurserymen would label their Asian-based cultivars as "Teas" if they possessed the desirable Tea flower form, and "Chinas" if they did not.[9] Like the Chinas, the Teas are not hardy in colder climates. Examples: 'Lady Hillingdon', 'Maman Cochet', 'Duchesse de Brabant'.
Bourbon rose 'Climbing Souvenir de la Malmaison' (Béluze 1843 / Bennett 1893)

 

Bourbon

Bourbons originated on the Île de Bourbon (now called Réunion) off the coast of Madagascar in the Indian Ocean. They are most likely the result of a cross between the Autumn Damask and the 'Old Blush' China rose, both of which were frequently used as hedging materials on the island. They flower repeatedly over vigorous, frequently semi-climbing shrubs with glossy foliage and purple-tinted canes. They were first Introduced in France in 1823. Examples: 'Louise Odier', 'Mme. Pierre Oger', 'Zéphirine Drouhin'.
Noisette rose 'Desprez à fleurs jaunes' (Desprez 1830)

 

Noisette

The first Noisette rose was raised as a hybrid seedling by a South Carolina rice planter named John Champneys. Its parents were the China Rose 'Parson's Pink' and the autumn-flowering musk rose (Rosa moschata), resulting in a vigorous climbing rose producing huge clusters of small pink flowers from spring to fall. Champneys sent seedlings of his rose (called 'Champneys' Pink Cluster') to his gardening friend, Philippe Noisette, who in turn sent plants to his brother Louis in Paris, who then introduced 'Blush Noisette' in 1817. The first Noisettes were small-blossomed, fairly winter-hardy climbers, but later infusions of Tea rose genes created a Tea-Noisette subclass with larger flowers, smaller clusters, and considerably reduced winter hardiness. Examples: 'Blush Noisette', 'Lamarque' (Noisette); 'Mme. Alfred Carriere', 'Marechal Niel' (Tea-Noisette). (See French and German articles on Noisette roses)

 

Hybrid Perpetual

Hybrid Perpetual rose 'La Reine' (Laffay 1844)
The dominant class of roses in Victorian England, hybrid perpetuals (a misleading translation of hybrides remontants, 'reblooming hybrids') emerged in 1838 as the first roses which successfully combined Asian remontancy with the Old European lineages. Since re-bloom is a recessive trait, the first generation of Asian/European crosses (Hybrid Chinas, Hybrid Bourbons, Hybrid Noisettes) were stubbornly once-blooming, but when these roses were recrossed with themselves or with Chinas or teas, some of their offspring flowered more than once. The Hybrid Perpetuals thus were something of a miscellany, a catch-all class derived to a great extent from the Bourbons but with admixtures of Chinas, teas, damasks, gallicas, and to a lesser extent Noisettes, albas and even centifolias.[10] They became the most popular garden and florist roses of northern Europe at the time, as the tender tea roses would not thrive in cold climates, and the Hybrid Perpetuals' very large blooms were well-suited to the new phenomenon of competitive exhibitions. The "perpetual" in the name hints at repeat-flowering, but many varieties of this class had poor re-flowering habits; the tendency was for a massive spring bloom, followed by either scattered summer flowering, a smaller autumn burst, or sometimes nothing at all until next spring. Due to a limited colour palette (white, pink, red) and lack of reliable repeat-bloom, the hybrid perpetuals were ultimately overshadowed by their own descendants, the Hybrid Teas. Examples: 'Ferdinand Pichard', 'Reine Des Violettes', 'Paul Neyron'.
Hybrid Musk rose 'Moonlight' (Pemberton 1913)

 

Hybrid Musk

Although they arose too late to qualify technically as Old Garden Roses, the hybrid musks are often informally classed with them, since their growth habits and care are much more like the OGRs than Modern Roses. The hybrid musk group was primarily developed by Rev. Joseph Pemberton, a British rosarian, in the first decades of the 20th century, based upon 'Aglaia', a 1896 cross by Peter Lambert. A seedling of this rose, 'Trier', is considered to the foundation of the class. The genetics of the class are somewhat obscure, as some of the parents are unknown. Rose multiflora, however, is known to be one parent, and R. moschata (the musk rose) also figures in its heritage, though it is considered to be less important than the name would suggest. Hybrid musks are disease-resistant, remontant and generally cluster-flowered, with a strong, characteristic "musk" scent.[11][12] Examples include 'Buff Beauty' and 'Penelope'.

Hybrid Rugosa

Rugosa rose 'Blanc Double de Coubert' (Cochet 1893)
The Rugosas likewise are not officially Old Garden Roses, but tend to be grouped with them. Derived from the R. rugosa species of Japan and Korea beginning in the 1880s, these vigorous roses are extremely hardy with excellent disease resistance. Most are extremely fragrant, repeat bloomers with moderately double flat flowers. The defining characteristic of a Hybrid Rugosa rose is its wrinkly leaves, but some hybrids do lack this trait. These roses will often set hips. Examples include 'Hansa' and 'Roseraie de l'Häy'.

Bermuda "Mystery" Roses

A group of several dozen "found" roses that have been grown in Bermuda for at least a century. The roses have significant value and interest for those growing roses in tropical and semi-tropical regions, since they are highly resistant to both nematode damage and the fungal diseases that plague rose culture in hot, humid areas, and capable of blooming in hot and humid weather. Most of these roses are likely Old Garden Rose cultivars that have otherwise dropped out of cultivation, or sports thereof. They are "mystery roses" because their "proper" historical names have been lost. Tradition dictates that they are named after the owner of the garden where they were rediscovered.

Miscellaneous

There are also a few smaller classes (such as Scots, Sweet Brier) and some climbing classes of old roses (including Ayrshire, Climbing China, Laevigata, Sempervirens, Boursault, Climbing Tea, and Climbing Bourbon). Those classes with both climbing and shrub forms are often grouped together.

 

Modern Garden Roses

A modern garden rose at University of the Pacific (United States).

Classification of modern roses can be quite confusing because many modern roses have old garden roses in their ancestry and their form varies so much. The classifications tend to be by growth and flowering characteristics, such as "large-flowered shrub", "recurrent, large-flowered shrub", "cluster-flowered", "rambler recurrent", or "ground-cover non-recurrent". The following includes the most notable and popular classifications of Modern Garden Roses:
A 'Memoriam' hybrid tea rose (von Abrams 1962)

 

Hybrid Tea

Main article: Hybrid Tea
The favourite rose for much of the history of modern roses, hybrid teas were initially created by hybridising Hybrid Perpetuals with Tea roses in the late 19th century. 'La France', created in 1867, is universally acknowledged as the first indication of a new class of roses. Hybrid teas exhibit traits midway between both parents: hardier than the teas but less hardy than the hybrid perpetuals, and more ever-blooming than the hybrid perpetuals but less so than the teas. The flowers are well-formed with large, high-centred buds, and each flowering stem typically terminates in a single shapely bloom. The shrubs tend to be stiffly upright and sparsely foliaged, which today is often seen as a liability in the landscape. Hybrid teas became the single most popular class of garden rose of the 20th century; today, their reputation as being more high maintenance than many other rose classes has led to a decline in hybrid tea popularity among gardeners and landscapers in favour of lower-maintenance "landscape" roses. The hybrid tea remains the standard rose of the floral industry, however, and is still favoured in small gardens in formal situations. Examples: 'Peace' (yellow), 'Garden Party' (white), 'Mister Lincoln' (red), 'Double Delight' (bi-colour cream and red).

 

Pernetiana

Pernetiana rose 'Soleil d'Or', the first of its class (Pernet 1900)
The French breeder Joseph Pernet-Ducher initiated the first class of roses to include genes from the old Austrian briar rose (Rosa foetida) with his 1900 introduction of 'Soleil d'Or.' This resulted in an entirely new colour range for roses: shades of deep yellow, apricot, copper, orange, true scarlet, yellow bicolours, lavender, gray, and even brown were now possible. Originally considered a separate class, the Pernetianas or Hybrid Foetidas were officially merged into the Hybrid Teas in 1930. The new colour range did much to skyrocket hybrid tea popularity in the 20th century, but these colours came at a price: Rosa foetida also passed on a tendency toward disease-susceptibility, scentless blooms, and an intolerance of pruning to its descendants.

Polyantha

Literally "many-flowered" roses, from the Greek "poly" (many) and "anthos" (flower). Originally derived from crosses between two East Asian species (Rosa chinensis and R. multiflora), polyanthas first appeared in France in the late 19th century alongside the hybrid teas. They featured short plants — some compact, others spreading in habit — with tiny blooms (1" in diameter on average) carried in large sprays, in the typical rose colours of white, pink and red. Their main claim to fame was their prolific bloom: From spring to fall, a healthy polyantha shrub might be literally covered in flowers, creating a strong colour impact in the landscape. Polyantha roses are still regarded as low-maintenance, disease-resistant garden roses today, and remain popular for that reason. Examples: 'Cecile Brunner', 'The Fairy', 'Red Fairy', 'Pink Fairy'.

Floribunda

Rosa 'Borussia', a modern Floribunda rose
Rose breeders quickly saw the value in crossing polyanthas with hybrid teas, to create roses that bloomed with the polyantha profusion, but with hybrid tea floral beauty and colour range. In 1909, the first polyantha/hybrid tea cross, 'Gruss an Aachen,' was created, with characteristics midway between both parent classes. As the larger, more shapely flowers and hybrid-tea like growth habit separated these new roses from polyanthas and hybrid teas alike, a new class was created and named Floribunda, Latin for "many-flowering." Typical floribundas feature stiff shrubs, smaller and bushier than the average hybrid tea but less dense and sprawling than the average polyantha. The flowers are often smaller than hybrid teas but are carried in large sprays, giving a better floral effect in the garden. Floribundas are found in all hybrid tea colours and with the classic hybrid tea-shaped blossom, sometimes differing from hybrid teas only in their cluster-flowering habit. Today they are still used in large bedding schemes in public parks and similar spaces. Examples: 'Anne Harkness', 'Dainty Maid', 'Iceberg', 'Tuscan Sun'.

Grandiflora

Grandifloras (Latin for "large-flowered") were the class of roses created in the mid-20th century to designate back-crosses between hybrid teas and floribundas that fit neither category — specifically, the 'Queen Elizabeth' rose, which was introduced in 1954.[13] Grandiflora shrubs are typically larger than either hybrid teas or floribundas, and feature hybrid tea-style flowers borne in small clusters of three to five, similar to a floribunda. Grandifloras maintained some popularity from about the 1950s to the 1980s but today they are much less popular than either the hybrid teas or the floribundas. Examples: 'Queen Elizabeth', 'Comanche,' 'Montezuma'.
Meillandine (a miniature rose) in a terracotta flowerpot

 

Miniature

All of the classes of Old Garden Roses—gallicas, centifolias, etc.—had corresponding miniature forms, although these were once-flowering just as their larger forms were. As with the standard-sized varieties, miniature Old Garden roses were crossed with repeat-blooming Asian species to produce everblooming miniature roses. Today, miniature roses are represented by twiggy, repeat-flowering shrubs ranging from 6" to 36" in height, with most falling in the 12"–24" height range. Blooms come in all the hybrid tea colours; many varieties also emulate the classic high centred hybrid tea flower shape. Miniature roses are often marketed and sold by the floral industry as houseplants, but it is important to remember that these plants are largely descended from outdoor shrubs native to temperate regions; thus, most miniature rose varieties require an annual period of cold dormancy to survive. (Examples: 'Petite de Hollande' (Miniature Centifolia, once-blooming), 'Cupcake' (Modern Miniature, repeat-blooming). Miniature garden roses only grow in the summer.

Climbing and rambling

Rosa 'Zéphirine Drouhin', a climbing Bourbon rose (Bizot 1868)
As is the case with Miniature roses, all aforementioned classes of roses, both Old and Modern, have "climbing" forms, whereby the canes of the shrubs grow much longer and more flexible than the normal ("bush") forms. In the Old Garden Roses, this is often simply the natural growth habit of many cultivars and varieties; in many Modern roses, however, climbing roses are the results of spontaneous mutations. For example, 'Climbing Peace' is designated as a "Climbing Hybrid Tea," for it is genetically identical to the normal "shrub" form of the 'Peace' hybrid tea rose, except that its canes are long and flexible, i.e. "climbing." Most Climbing roses grow anywhere from 8'–20' in height and exhibit repeat-bloom. Rambler roses, although technically a separate class, are often lumped together with climbing roses. They also exhibit long, flexible canes, but are distinguished from true climbers in two ways: A larger overall size (20'–30' tall is common), and a once-blooming habit. Both climbing roses and rambling roses are not true vines such as ivy, clematis or wisteria; they lack the ability to cling to supports on their own, and must be manually trained and tied over structures such as arbors and pergolas. Examples: 'Blaze' (repeat-blooming climber), 'American Pillar' (once-blooming rambler).

 

English / David Austin


Austin rose 'Abraham Darby' (1985)
Although not officially recognized as a separate class of roses by any established rose authority, English (aka David Austin) roses are often set aside as such by consumers and retailers alike. Development started in the 1960s by David Austin of Shropshire, England, who wanted to rekindle interest in Old Garden Roses by hybridizing them with modern hybrid teas and floribundas. The idea was to create a new group of roses that featured blooms with old-fashioned shapes and fragrances, evocative of classic gallica, alba and "damask" roses, but with modern repeat-blooming characteristics and the larger modern colour range as well. Austin mostly succeeded in his mission; his tribe of "English" roses, now numbering hundreds of varieties, has been warmly embraced by the gardening public and are widely available to consumers. David Austin roses are still actively developed, with new varieties released regularly. The typical winter-hardiness and disease-resistance of the classic Old Garden Roses has largely been compromised in the process; many English roses are susceptible to the same disease problems that plague modern hybrid teas and floribundas, and many are not hardy north of USDA Zone 5. Examples: 'Mary Rose', 'Graham Thomas', 'Tamora'.

Canadian Hardy Roses

Developed for the extreme weather conditions of Canadian winters, these roses were developed by Agriculture Canada at the Morden Research Station in Morden, Manitoba and the Experimental Farm in Ottawa (and later at L'Assomption, Québec). These two main lines are called the Parkland series and the Explorer series. These programs have now been discontinued; however the remaining plant stock has been taken over by private breeders via the Canadian Artists series. Derived mostly from crosses of native Canadian species and more tender roses, these plants are extremely tolerant of cold weather, some down to -35C. A wide diversity of forms and colours were achieved. Examples include 'Morden Centennial', 'Morden Sunrise, 'Winnipeg Parks' and 'Cuthbert Grant'.
Other notable Canadian breeders include Frank Skinner, Percy Wright, Isabella Preston, Georges Bugnet and Robert Erskine.

Landscape Roses

An example of a shrub rose
These are a modern category of rose developed mainly for mass amenity planting. They are collectively known as shrub roses. In the late 20th century, traditional hybrid tea and floribunda rose varieties fell out of favour amid gardeners and landscapers, as they are often labour and chemical intensive plants susceptible to a myriad of pest and disease problems. So-called "landscape" roses have thus been developed to fill the consumer desire for a garden rose that offers colour, form and fragrance, but is also low maintenance and easy to care for. Most landscape roses having the following characteristics:
  • Lower growing habit, usually under 60 cm (24 inches)
  • Repeat flowering
  • Disease and pest resistance
  • Non suckering, growing on their own roots.
Principal parties involved in the breeding of new Landscape Roses varieties are: Werner Noak (Germany), Meidiland Roses (France), Boot & Co. (Netherlands), and William Radler (USA).

Pruning


This rosebush has been pruned to its current form
Rose pruning, sometimes regarded as a horticultural art form, is largely dependent on the type of rose to be pruned, the reason for pruning, and the time of year it is at the time of the desired pruning.
Most Old Garden Roses of strict European heritage (albas, damasks, gallicas, etc.) are shrubs that bloom once yearly, in late spring or early summer, on two-year-old (or older) canes. As such, their pruning requirements are quite minimal, and are overall similar to any other analogous shrub, such as lilac or forsythia. Generally, only old, spindly canes should be pruned away, to make room for new canes. One year old canes should never be pruned because doing so will remove next year's flower buds. The shrubs can also be pruned back lightly, immediately after the blooms fade, to reduce the overall height or width of the plant. In general, pruning requirements for OGRs are much less laborious and regimented than for Modern hybrids.
Modern hybrids, including the hybrid teas, floribundas, grandifloras, modern miniatures, and English roses, have a complex genetic background that almost always includes China roses (R. chinensis). China roses were evergrowing, everblooming roses from humid subtropical regions that bloomed constantly on any new vegetative growth produced during the growing season. Their modern hybrid descendants exhibit similar habits; unlike Old European Roses, modern hybrids bloom continuously (until stopped by frost) on any new canes produced during the growing season. They therefore require pruning away of any spent flowering stem in order to divert the plant's energy into producing new growth and hence new flowers.
Additionally, Modern Hybrids planted in cold winter climates will almost universally require a "hard" annual pruning (reducing all canes to 8"–12" in height) in early spring. Again, because of their complex China rose background, modern hybrids are typically not as cold hardy as European OGRs, and low winter temperatures often desiccate or kill exposed canes. In spring, if left unpruned, these damaged canes will often die back all the way to the shrub's root zone, resulting in a weakened, disfigured plant. The annual "hard" pruning of hybrid teas, floribundas, etc. should generally be done in early spring; most gardeners coincide this pruning with the blooming of forsythia shrubs. Canes should be cut about 1/2" above a vegetative bud (identifiable as a point on a cane where a leaf once grew).
For both Old Garden Roses and Modern Hybrids, any weak, damaged or diseased growth should be pruned away completely, regardless of the time of year. Any pruning of any rose should also be done so that the cut is made at a forty five degree angle above a vegetative bud. This helps the pruned stem callus over more quickly, and also mitigates moisture buildup over the cut, which can lead to disease problems.
For all general rose pruning (including cutting flowers for arrangements), sharp secateurs (hand-held, sickle-bladed pruners) should be used to cut any growth 1/2" or less in diameter. For canes of a thickness greater than 1/2", pole loppers or a small handsaw are generally more effective; secateurs may be damaged or broken in such instances.

Deadheading

"Deadheading" is the simple practice of manually removing any spent, faded, withered, or discoloured flowers from rose shrubs over the course of the blooming season. The purpose of deadheading is to encourage the plant to focus its energy and resources on forming new offshoots and blooms, rather than in fruit production. Deadheading may also be performed, if spent flowers are unsightly, for aesthetic purposes. Roses are particularly responsive to deadheading. Deadheading should be done by taking the stem down to the first 5-leaflet leaf, not just the base of the flower. This encourages further branching and flower production.
Deadheading causes different effects on different varieties of roses. For continual blooming varieties, whether Old Garden roses or more modern hybrid varieties, deadheading allows the rose plant to continue forming new shoots, leaves, and blooms. For "once-blooming" varieties (that bloom only once each season), deadheading has the effect of causing the plant to form new green growth, even though new blooms will not form until the next blooming season.
For most rose gardeners, deadheading is used to refresh the growth of the rose plants to keep the rose plants strong, vibrant, and productive.
Species roses such as Rosa glauca or Rosa moyesii - those which produce good hips - should not be deadheaded.

Pests and diseases

Main articles: Pests and diseases of roses and List of rose diseases
Roses are subject to several diseases, such as rose rust (Phragmidium mucronatum), rose black spot, and powdery mildew. Fungal diseases in the Rose are best solved by a preventative fungicidal spray program rather than by trying to cure an infection after it emerges on the plant. After the disease is visible, its spread can be minimized through pruning and the use of fungicides, although the actual infection cannot be reversed. Certain rose varieties are considerably less susceptible than others to fungal diseases.
The main pest affecting roses is the aphid (greenfly), which sucks the sap and weakens the plant. (Ladybugs are a predator of aphids and should be encouraged in the rose garden.) In areas where they are endemic Japanese beetles (Popillia japonica) take a heavy toll on rose flowers and foliage; rose blooms can also be destroyed by infestations of thrips (Thysanoptera spp). Roses are also used as food plants by the larvae of some Lepidoptera (butterfly and moth) species; see list of Lepidoptera that feed on roses. The spraying with insecticide of roses is often recommended but should be done with care to minimize the loss of beneficial insects.

Uses

Roses are best known for their flowers. Roses are popular garden shrubs, as flowering shrubs. They are also grown as cut flowers, as one of the most popular and commonly sold florists' flowers.
A few roses are grown for scented foliage (such as Rosa rubiginosa, ornamental thorns, Rosa sericea or their ornamental fruit Rosa moyesii).
The rose hip, the fruit of some species, is used as a minor source of Vitamin C. Roses may also be planted as hedging, and for game cover.

Perfume

Main article: Rose oil
Rose perfumes are made from attar of roses or rose oil, which is a mixture of volatile essential oils obtained by steam distilling the crushed petals of roses. The technique originated in Persia (the word Rose itself is from Persian) then spread through Arabia and India, but nowadays about 70% to 80% of production is in the Rose Valley near Kazanluk in Bulgaria, with some production in Qamsar in Iran and Germany.[citation needed] The Kaaba in Mecca is annually washed by the Iranian rose water from Qamsar. In Bulgaria, Iran and Germany, damask roses (Rosa damascena 'Trigintipetala') are used. In the French rose oil industry Rosa centifolia is used. The oil is transparent pale yellow or yellow-grey in colour. 'Rose Absolute' is solvent-extracted with hexane and produces a darker oil, dark yellow to orange in colour. The weight of oil extracted is about one three-thousandth to one six-thousandth of the weight of the flowers; for example, about two thousand flowers are required to produce one gram of oil.
Geraniol (C10H18O)
The main constituents of attar of roses are the fragrant alcohols geraniol and l-citronellol; and rose camphor, an odourless paraffin. β-Damascenone is also a significant contributor to the scent.
Renoir's painting of cabbage roses, Roses in a vase


 

 

Art

Roses are often portrayed by artists. The Luxembourg born Belgian artist Pierre-Joseph Redouté produced some of the most detailed paintings of roses.
Henri Fantin-Latour was also a prolific painter of still life, particularly flowers including roses. The Rose 'Fantin-Latour' was named after the artist.
Other impressionists including Claude Monet, Paul Cézanne and Pierre-Auguste Renoir have paintings of roses among their works.

Symbolism

Further information: Rose (symbolism)
Red Roses
Selling roses on St George's Day in Catalonia
The rose has always been valued for its beauty and has a long history of symbolism. Roses are ancient symbols of love and beauty. 'Rose' means pink or red in a variety of languages (such as Romance languages, Greek, and Polish). The rose was sacred to a number of goddesses (including Isis and Aphrodite), and is often used as a symbol of the Virgin Mary. The ancient Greeks and Romans identified the rose with their goddesses of love referred to as Aphrodite and Venus. In Rome a wild rose would be placed on the door of a room where secret or confidential matters were discussed. The phrase sub rosa, or "under the rose", means to keep a secret — derived from this ancient Roman practice.
Early Christians identified the five petals of the rose with the five wounds of Christ. Despite this interpretation, their leaders were hesitant to adopt it because of its association with Roman excesses and pagan ritual. The red rose was eventually adopted as a symbol of the blood of the Christian martyrs. Roses also later came to be associated with the Virgin Mary.
Rose culture came into its own in Europe in the 19th century with the introduction of perpetual blooming roses from China. There are currently thousands of varieties of roses developed for bloom shape, size, fragrance and even for lack of prickles.
The rose is the national flower of England and the United States,[14] as well as being the symbol of England Rugby, and of the Rugby Football Union. It is also the provincial flower of Yorkshire and Lancashire in England (the white rose and red rose respectively), of Alberta (the wild rose) in Canada, and of Islamabad Capital Territory in Pakistan. It is the state flower of four US states: Iowa and North Dakota (R. arkansana), Georgia (R. laevigata), and New York[15] (Rosa generally). Portland, Oregon counts "City of Roses" among its nicknames, and holds an annual Rose Festival.
Roses are occasionally the basis of design for rose windows, such windows comprising five or ten segments (the five petals and five sepals of a rose) or multiples thereof; however most Gothic rose windows are much more elaborate and were probably based originally on the wheel and other symbolism.
A red rose (often held in a hand) is a symbol of socialism or social democracy: it is used as a symbol by British, Irish, French, Spanish, Portuguese, Norwegian, Danish, Swedish, Finnish, Brazilian, Dutch, Bulgarian and other European labour, socialist or social democratic parties, mostly adopted in the period after World War II.[16]
The White Rose was a World War II non violent resistance group in Germany.
A bouquet of red roses is often used to show love. It is used as a Valentine's Day gift in many countries.
On St George's Day in Catalonia people offer dark red roses as gifts, especially between lovers. The Virolai, a hymn to the Virgin of Montserrat, one of the black Madonnas of Europe, begins with the words: "Rosa d’abril, Morena de la serra..." (April rose, dusky lady of the mountain chain...). Therefore this virgin is sometimes known as “Rosa d’abril”. The red rose is thus widely accepted as an unofficial symbol of Catalonia.[17]

Quotes

Rosa gallica Evêque, painted by Redouté

Notable rose growers

The examples and perspective in this article may not represent a worldwide view of the subject. Please improve this article and discuss the issue on the talk page. (August 2010)

Rose Capital of America

"Tyler: Rose Capital of America"
Tyler, Texas, has been nicknamed the "Rose Capital of America" because of its large role in the rose-growing industry. It boasts the nation's largest municipal rose garden and hosts the Texas Rose Festival each October, which draws thousands of spectators.

Individuals

Some rose growers are known for their particular contributions to the field. These include:

Posted by at No comments:
Subscribe to: Posts (Atom)