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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 false acacia common robinia
bastard acacia black locust fragrant white locust locust yellow locust
Family Fabaceae
Genus Robinia are vigorous suckering trees and shrubs, sometimes thorny, with pinnate leaves and racemes of pea-type flowers in early summer, sometimes followed by seed pods
Details R. pseudoacacia is a fast-growing, spreading tree to 25m tall with deeply furrowed rough bark and spines formed from stipules on twigs and suckers. The dark green leaves comprise 5-11 pairs of oval leaflets. Dense, drooping clusters of slightly scented white flowers, each 15-20mm long and with a yellow blotch at the base of the standard petal, are borne in late spring and summer and are followed in autumn by hairless, linear to oblong pods containing 4-10 seeds
Plant range Europe, N America
Foliage Deciduous
Habit Columnar/Upright
Fragrance Flower
Toxicity All parts may cause severe discomfort if ingested. Wear gloves and wash hands after handling
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H6
Full Sun
Aspect North-facing or West-facing or South-facing or East-facing
Exposure Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Well-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height Higher than 12 metres
Ultimate spread wider than 8 metres
Time to ultimate height 20-50 years
Cultivation Grow in moderately fertile soil; will tolerate poor dry soils. Larger trees develop brittle branches which may be damaged or dropped in strong winds. Suckering may be a problem
Propagation Propagate by seed or from root cuttings or from suckers
Suggested planting locations and garden types Drought Resistant Low Maintenance
Pruning Pruning group 1 or Pruning group 7; pruning should be done in late summer or early autumn to prevent bleeding; sucker removal if necessary, in autumn
Pests Generally trouble free
Diseases Generally disease free but in more recent years there have been Frisia dieback problems
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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.