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Rhododendron 'Shamrock'

rhododendron 'Shamrock'

'Shamrock' is a compact, dwarf, spreading shrub up to 75cm high and wide with small evergreen leaves and many trusses of from five to nine funnel-shaped, pale yellow flowers, 0.7-2.5cm across, tinged green and spotted yellow inside, in early and mid-spring

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
5–10 years
Ultimate spread
0.5–1 metres
Growing conditions
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid
Colour & scent
StemFlowerFoliageFruit
Spring Yellow Green
Summer Green
Autumn Green
Winter Green
Position
  • Full sun
  • Partial shade
Aspect

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

Exposure
Sheltered
Hardiness
H6
Botanical details
Family
Ericaceae
Native to the UK
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

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
  • Low Maintenance
  • Banks and slopes
  • Flower borders and beds
Pruning

Pruning group 1 (little or no pruning of trees and shrubs) or pruning group 8 (early-flowering evergreen shrubs)

Pests

May be susceptible to vine weevil, rhododendron and azalea whitefly, rhododendron leafhopper, pieris lacebug, scale insects, caterpillars and aphids

Diseases

May be susceptible to various Rhododendron diseases including powdery mildews, rhododendron petal blight, rhododendron bud blast, silver leaf and honey fungus

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