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Mahonia × wagneri 'Pinnacle' AGM

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© RHS 2003

Characteristics

Plant type

Shrub

Habit

Bushy

Resilience

Hardiness

old H4 (hardy)

Colour

Flower

Yellow in Spring

Foliage

Bronze and Green in Spring
Green in Autumn, Summer and Winter

Fruit

Black and Blue in Autumn

Size

Ultimate height

1-1.5 metres

Ultimate spread

1-1.5 metres

Time to ultimate height

10-20 years


Preferred common name

Oregon grape 'Pinnacle'

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

'Pinnacle' is a vigorous medium-sized evergreen shrub of upright growth, with glossy pinnate leaves which open coppery-tinted. Flowers bright yellow, in dense terminal clusters in spring, followed by blue-black berries

Synonym(s)

  • Berberis aquifolium 'Fascicularis'
  • Mahonia aquifolium 'Fascicularis'
  • Mahonia pinnata misapplied
  • Mahonia × wagneri 'Pinnata'

How to grow

Sunlight

  • Part shade
  • Full shade

Aspect

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

Cultivation

Good for a woodland setting in a sheltered or exposed situation with full sun or partial shade

Soil

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

Propagation

Propagate by seed and semi-hardwood cuttings

Suggested planting locations and garden types

City/Courtyard Gardens, Coastal, Cottage/Informal Garden, Flower borders and beds, Hedging/Screens or Low Maintenance


How to care

Pruning

Pruning group 8

Pests

Generally pest free

Diseases

Generally disease free