Rhododendron calostrotum subsp. keleticum

RHS Plant Profile

beautiful-covering rhododendron

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Synonyms

Rhododendron keleticum

Shrubs

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A dwarf evergreen shrub with an almost prostrate habit, forming dense mounds of foliage to 30cm high. Leaves are up 1cm long, ovate, glossy and dark green above, brown and densely scaly beneath. Produces small clusters of widely funnel-shaped purplish-red flowers, with dark red marking on the upper petals, in May and June

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 5–10 years
Max Spread: 0.5-1 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid

Position

Full sun Partial shade

Aspect: East–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): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Ericaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Spreading branched
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: Correct
Plant Range: NE Myanmar, W China

How to Grow

Cultivation

Grow in moist but well-drained, humus rich, acidic soil, in full sun or light shade. Choose a site with good ventilation, away from extremes of temperature (such as frost pockets and sun traps). Mulch annually, ideally with leaf mould. See rhododendron cultivation for more detailed advice

Propagation

Propagate by semi-hardwood cuttings in late summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Rock garden
Flower borders and beds
Ground cover

Pruning

Pruning group 8 (evergreens); trim lightly after flowering to maintain shape

Pests

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

Diseases

May be susceptible to rhododendron diseases including rhododendron bud blast and rhododendron petal blight, as well as powdery mildews, honey fungus, rust, leafy gall, silver leaf and Phytophthora root and shoot rots