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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names Japanese mahonia
Synonyms Mahonia tikushiensis
Family Berberidaceae
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
Details 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
Foliage Evergreen
Habit Bushy
Fragrance Flower
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H5
Full Shade
Partial Shade
Aspect North-facing or West-facing or East-facing or South-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Well-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 1-1.5 metres
Ultimate spread 1.5-2.5 metres
Time to ultimate height 10-20 years
Cultivation Grow in any well-drained or moist but well-drained soil in shade or partial shade. Good for a woodland setting
Propagation Propagate by seed and semi-hardwood cuttings
Suggested planting locations and garden types Banks and Slopes Low Maintenance Architectural Wildlife Gardens
Pruning Pruning group 8
Pests Generally pest free
Diseases A rust and powdery mildews may be a problem
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