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Scented Rhododendrons suitable for conservatory or cool greenhouse are marked with an asterisk.
Genus of more than 1000 species of evergreen and deciduous trees and shrubs from Europe, Asia, Australasia and North America, particularly southwestern China, Tibet, Burma, northern India and New Guinea.
Evergreen rhododendrons vary greatly in size and usually have bell-shaped flowers with 10 stamens.
Azaleas have smaller, thinner leaves and are generally medium-sized shrubs with smaller, funnel-shaped flowers with, usually, 5 stamens.
The problem rhododendron, vigorous hybrids of R. ponticum, which is colonizing large areas has been given the name R x superponticum and is subject to EU legislation under the "Invasive Alien Species Regulation".
Evergreen - broadly elliptic, dark-green leaves 3-4.5cm (1¼-1¾in) long, bristly above, scaly and yellowish green beneath.
Height - 1m (3ft)
Spread - 1.5m (5ft)
Dwarf shrub - Typically only grows to a maximum of one or two feet in height but there will be some exceptions. - densely branched shrub with bristly shoots. Produces trusses of up to 3 flowers 5cm (2in) across with chocolate-brown anthers.
Half hardy - unheated greenhouse / mild winter - Hardy in coastal and relatively mild parts of the UK except in severe winters and a risk from sudden (early) frosts. May be hardy elsewhere with wall shelter or good micro-climate. Likely to be damaged or killed in cold winters. Plant can withstand temperatures down to -5°C (23°F)
Additional Features - Pests & Diseases - vine weevils, whiteflies, scale insects, caterpillars, aphids, powdery mildew, bud blast, honey fungus.
Place of origin - southeastern Tibet.
Flower Shape - Saucer-shaped
Hardiness - Frost hardy (down to -5) -
Soil Conditions - Fertile moist well-drained soil - humus-rich
Neutral to acid soil - ideally pH4.5 - 5.5.
- Dead Heading
- Dead Heading - Video Tip ondemand_video
- Pruning - Video Tip ondemand_video
- Weed Killing
- Pests and Diseases
- Honey Fungus - Video Tip ondemand_video
- Further Reading
- Rhododendron genestrianum - Video Tip ondemand_video
- Scented Rhododendrons - Video Tip ondemand_video
- Growing from seed
- Growing from cuttings
- Propagation by layering - Video Tip ondemand_video
- Propagation by other means
- Making a hybrid - Video Tip ondemand_video
- Making a hairy or scaly cross - Video Tip ondemand_video
- Caerhays bred 'Red Centurian'
- When is the right time to collect seeds?
- When are seeds actually ripe and ready for collection?
- Magnolia seed collection - Video Tip ondemand_video
- Cornus capitata seed collection - Video Tip ondemand_video