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Shrubs

Mahonia japonica

Japanese mahonia

An erect evergreen shrub to 2m tall, with large, dark green leathery pinnate leaves to 45cm long, with up to 19 sharp-toothed, slender leaflets, and small, fragrant pale yellow flowers in spreading or drooping sprays to 25cm long, from late autumn to early spring, followed by blue-black berries

Synonyms

Mahonia tikushiensis

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Ultimate height

1–1.5 metres

Time to ultimate height

10–20 years

Ultimate spread

1.5–2.5 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full shade
Partial shade
Full sun

Aspect

North–facing or West–facing or East–facing or South–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)

Botanical details

Family: Berberidaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Bushy
Potentially harmful: Berries are ornamental, not 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

Grow in humus-rich moist but well-drained soil, suited to full or partial shade in a sheltered position but tolerant of sun if soil is not too dry. See mahonia cultivation for further information

Propagation

Propagate by seed and semi-hardwood cuttings

Suggested planting locations and garden types

Architectural
Wildlife gardens
City and courtyard gardens
Coastal
Cottage and informal garden
Low Maintenance
Flower borders and beds
Hedging and screens

Pruning

Pruning group 8

Pests

Generally pest-free

Diseases

Generally disease-free

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