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Mahonia japonica AGM

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© RHS 1999

Characteristics

Plant type

Shrub

Habit

Bushy

Fragrance

Flower

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Pale Yellow in Autumn, Spring and Winter

Foliage

Dark Green in Autumn, Spring, Summer and Winter

Fruit

Black and Blue in Spring and Winter

Size

Ultimate height

1-1.5 metres

Ultimate spread

1.5-2.5 metres

Time to ultimate height

10-20 years


Preferred common name

Japanese mahonia

Family

Berberidaceae


Mahonia are evergreen shrubs with leathery, pinnate leaves which are often spine-toothed, and clustered racemes of sometimes fragrant yellow flowers, sometimes followed by black or purple berries

M. japonica is an erect medium-sized evergreen shrub with large, spined, leathery pinnate leaves and small, fragrant light yellow flowers in spreading or drooping sprays from late autumn to early spring, followed by blue-black berries

How to grow

Sunlight

  • Part shade
  • Full shade

Aspect

  • North-facing, East-facing, South-facing or West-facing
  • Sheltered or Exposed

Cultivation

Grow in any well-drained or moist but well-drained soil in shade or partial shade. Good for a woodland setting

Soil

  • Well-drained or Moist but well-drained
  • Acid, Alkaline or Neutral
  • Chalk, Clay, Sand or Loam

Propagation

Propagate by seed and semi-hardwood cuttings

Suggested planting locations and garden types

Banks and Slopes, Low Maintenance, Wildlife Gardens or Architectural


How to care

Pruning

Pruning group 8

Pests

Generally pest free

Diseases

A rust and powdery mildews may be a problem