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Mahonia × wagneri 'Pinnacle' AGM

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© RHS 2003

Characteristics

Plant type

Shrub

Habit

Bushy

Resilience

Hardiness

H5 (hardy - cold winter)

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