The Royal Horticultural Society (RHS), founded in 1804 as the Horticultural Society of London, is the UK's leading gardening charity.
Clematis is a genus of about 300 species within the buttercup family, Ranunculaceae. Their garden hybrids have been popular among gardeners, beginning with Clematis × jackmanii, a garden standby since 1862; more hybrid cultivars are being produced constantly. They are mainly of Chinese and Japanese origin. Most species are known as clematis in English, while some are also known as traveller's joy, a name invented for the sole British native, C. vitalba, by the herbalist John Gerard; virgin's bower for C. terniflora, C. virginiana, and C. viticella; old man's beard, applied to several with prominent seedheads; leather flower for those with fleshy petals; or vase vine for the North American Clematis viorna.
Wisley is a village and civil parish in Surrey, England between Cobham and Woking, in the Borough of Guildford. It is the home of the Royal Horticultural Society's Wisley Garden. The River Wey runs through the village and Ockham and Wisley Commons form a large proportion of the parish on a high acid heathland, which is a rare soil type providing for its own types of habitat. It has a standard weather monitoring station, which has recorded some national record high temperatures.
RHS Garden Wisley is a garden run by the Royal Horticultural Society in Wisley, Surrey, south of London. It is one of five gardens run by the society, the others being Harlow Carr, Hyde Hall, Rosemoor, and Bridgewater. Wisley is the second most visited paid entry garden in the United Kingdom after the Royal Botanic Gardens, Kew, with 1,232,772 visitors in 2019.
The Award of Garden Merit (AGM) is a long-established annual award for plants by the British Royal Horticultural Society (RHS). It is based on assessment of the plants' performance under UK growing conditions.
RHS Garden Rosemoor is a public display garden run by the Royal Horticultural Society in north Devon, England.
Pyrrhalta viburni is a species of leaf beetle native to Europe and Asia, commonly known as the viburnum leaf beetle. It was first detected in North America in 1947 in Ontario, Canada. However, specimens had been collected in Annapolis Royal, Nova Scotia in 1924. In 1996 it was discovered in a park in New York, where native plantings of arrowwood were found to be heavily damaged by larval feeding. The UK-based Royal Horticultural Society stated that its members reported Pyrrhalta viburni as the "number one pest species" in 2010. Female beetles burrow into viburnum terminal twigs and create 'spaces' in pith tissue. Then they lay eggs in clusters and cover them with frass. Eggs overwinter in these cavities where they are protected from water loss and predation.
Ipheion uniflorum is a species of flowering plant, related to the onions, so is placed in the allium subfamily (Allioideae) of the Amaryllidaceae. It is known by the common name springstar, or spring starflower. Along with all the species of the genus Ipheion, some sources place it in the genus Tristagma, but research published in 2010 suggested that this is not correct. It is native to Argentina and Uruguay, but is widely cultivated as an ornamental and reportedly naturalized in Great Britain, France, Australia, New Zealand and the United States.
Clematis montana, the mountain clematis, also Himalayan clematis or anemone clematis, is a flowering plant in the buttercup family Ranunculaceae. A vigorous deciduous climber, in late spring it is covered with a mass of small blooms for a period of about four weeks. The flowers are white or pink, four-petalled, with prominent yellow anthers. It is native to mountain areas of Asia from Afghanistan to Taiwan.
Raymond John Evison OBE, VMH, is a nurseryman, lecturer, author and photographer. Born in 1944 he started his horticultural career at the age of 15 in Shropshire and moved to the island of Guernsey to set up The Guernsey Clematis Nursery in 1984.
Clematis alpina, the Alpine clematis, is a flowering deciduous vine of the genus Clematis. Like many members of that genus, it is prized by gardeners for its showy flowers. It bears 1 to 3-inch spring flowers on long stalks in a wide variety of colors. C. alpina is native to Europe; in the United States it grows best in American Horticultural Society zones 9 to 6, which are generally found in the southern USA.
Clematis aristata, known as Australian clematis, wild clematis, goat's beard or old man's beard, is a climbing shrub of the family Ranunculaceae, found in eastern Australia in dry and wet forests of Queensland, New South Wales, Victoria and Tasmania. In spring to early summer it produces mass displays of attractive star-shaped flowers usually borne in short panicles with each flower up to 70 mm diameter and possessing four narrow white or cream tepals. Fertile male and female reproductive structures occur in flowers of separate plants (dioecy) making this species an obligate outcrosser with pollen movement among plants most likely facilitated by insects. Each seed head on female plants consists of multiple achenes with each seed bearing a plumose awn 2–4.5 cm long promoting dispersal by wind.
Clematis napaulensis, the Nepal clematis, is a species of flowering plant in the buttercup family Ranunculaceae. It is native to China and the Indian subcontinent, including Nepal, whence the specific epithet napaulensis.
Saxifraga federici-augusti, common name Engleria saxifrage, is a herbaceous perennial plant belonging to the Saxifragaceae family. Its subspecies Saxifraga federici‑augusti subsp. grisebachii and the 'Wisley' cultivar of that subspecies have both gained the Royal Horticultural Society's Award of Garden Merit.
The Lindley Library in London is the largest horticultural library in the world. It is within the headquarters of the Royal Horticultural Society,
Frederick James Chittenden (1873–1950) was a British horticulturalist and first Director of the Royal Horticultural Society (RHS) Wisley Garden. He was the author of a number of books on horticulture.
William Gregor MacKenzie ALS VMH (1904–1995), known as Bill, was born in Scotland, where his father was head gardener at Ballimore, near Loch Fyne in Argyllshire.
Penstemon pinifolius, the pine-leaved penstemon or pine-needle beardtongue, is a species of flowering plant in the plantain family Plantaginaceae, native to the southwestern USA.
Clematis tangutica, the golden clematis, is a species of flowering plant in the family Ranunculaceae. It is found from Central Asia through to most of China, and it has been introduced to western Canada, Czechia, Slovakia, Switzerland, and the South Island of New Zealand. Its cultivars 'Bill MacKenzie' and 'Lambton Park', both members of the Tangutica Group, have gained the Royal Horticultural Society's Award of Garden Merit.
