Mahonia oiwakensis

Shrubs Trees

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A vigorous, upright, evergreen shrub or small tree about 7m tall, with large, glossy dark green leaves to 55cm long composed of widely spaced slender leaflets. Small golden-yellow flowers in terminal racemes to 25cm long, appear from autumn to winter, followed by glaucous blue-black fruit

Position

Full sun, Partial shade, Full shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

4-8 metres

Max Spread

2.5-4 metres

Size

Time to Maturity: 10–20 years
Max Spread: 2.5-4 metres
Max Height: 4-8 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade Full shade

Aspect: East–facing or North–facing or South–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Berberidaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy, Columnar upright
Potentially harmful: Berries are ornamentalnot to be eaten. Wear gloves and other protective equipment when handling
Genus: 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
Name Status: Correct
Plant Range: Taiwan

How to Grow

Cultivation

Tolerates a wide range of soil types and positions, but thrives in humus-rich, moist soil in full sun or partial shade with shelter from cold drying winds. See mahonia cultivation

Propagation

Propagate by seed in autumn or soon as ripe, or by semi-ripe cuttings from late summer to autumn

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Wildlife gardens
Low Maintenance

Pruning

Pruning group 8

Pests

Generally pest-free

Diseases

Generally disease-free