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Rhododendron ‘Alison Johnstone’

Azalea

Garden

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  • Rhododendron ‘Alison Johnstone’ | Copyright Greenplantswap 2019

Features

  • BloomsApril to July
  • Height1m to 2m
  • Spread1m to 2m
  • Growth HabitIrregular bushy
  • Flower ColourPale yellow and pink
  • Leaf ColourMid-dark green

Description

Rhododendron ‘Alison Johnstone’ (Azalea). This variety is a medium-sized bush, has a narrow, upright growth habit and blue-green rounded leaves. The flowers are tubular to funnel-shaped, bloom in small clusters, are yellow flushed with pink, and appear in spring.

Characteristics

Woody perennial, Deciduous or Evergreen, Shrub

Origin

Europe, N. America, Tibet and New Guinea

Interest and use

Ornamental, foliage, border, hedging

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  • Rhododendron ‘Alison Johnstone’ | Copyright Greenplantswap 2019

Needs

  • LightFull sun
  • HardinessFully hardy (min -15°C)
  • SoilClay, Humus-rich
  • Soil pH4.5 to 6.0
  • WaterMoist

Cultivation

There are many species but they all share the same general cultivation needs. They are fully hardy to frost tender, min 4-7C and will prefer dappled shade, but a considerable number will tolerate full sun, especially in cool climates. They will need loose open, well-aerated, acidic soil with plenty of humus to retain moisture. In wet areas or gardens with alkaline soil you should plant them in raised beds. Shallow planting is essential, as plants are surface-rooting. Dead-head spent flowers, wherever practical, to encourage energy into growth rather than seed production.

Propagation

Propagate by simple layering, dropping or semi-ripe cuttings in late summer.

Pests, diseases or disorders

Yellowing leaves are usually caused by poor drainage, excessively deep planting or lime in soil. Weevils and powdery mildew may also cause problems.

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