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Shrubs

Rhododendron 'Wilgen's Ruby'

rhododendron 'Wilgen's Ruby'

A bushy, rounded evergreen shrub with glossy dark green leaves and large round clusters of tubular-shaped dark red flowers appearing in late spring. This variety tolerates full sun

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Ultimate height

1.5–2.5 metres

Time to ultimate height

10–20 years

Ultimate spread

1.5–2.5 metres

Clay

Loam

Sand

Moisture

Moist but well–drained

pH

Acid

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or North–facing or South–facing or West–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Ericaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Bushy
Potentially harmful: Harmful if eaten. Wear gloves and other protective equipment when handling. Pets (dogs, cats, rabbits, tortoises) Harmful if eaten - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus: Rhododendron can be evergreen or deciduous shrubs or trees, with simple leaves, sometimes with a dense colourful indumentum of hairs on the lower side, and funnel-shaped, bell-shaped or tubular flowers that may be solitary or in short racemes
Name status: Accepted

How to grow

Cultivation

Grow in light dappled shade, in a site sheltered from cold, dry winds and late frosts, in moist but well-drained, humus-rich, acidic soil, preferably between pH4.5 and pH5.5; will also tolerate sun and dry soil; for more advice, see rhododendron cultivation

Propagation

Propagate by heeled semi-ripe cuttings in late summer, by layering in autumn, or by grafting in late winter or late summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Low Maintenance
Banks and slopes
Flower borders and beds
Wall side borders

Pruning

Pruning group 1 or pruning group 8

Pests

May be susceptible to vine weevil, rhododendron whiteflies, rhododendron leafhopper, lacebugs, scale insects, caterpillars, and aphids

Diseases

May be susceptible to powdery mildews, bud blast, honey fungus, rust, leafy gall, petal blight, silver leaf, Phytophthora root and shoot rots, and, if soil is not sufficiently acidic, lime-induced chlorosis; for more advice, see Rhododendron diseases

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