Robinia pseudoacacia

RHS Plant Profile
false acacia
false acacia RHS

Other common names

bastard acacia, black locust, common robinia, fragrant white locust, locust, yellow locust

Plants for pollinators
Trees

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

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
20–50 years
Max Spread
wider than 8 metres
Max Height
Higher than 12 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
North–facing or West–facing or South–facing or East–facing
Exposure
Sheltered
Hardiness
H6
Drought Resistance
Yes

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Fabaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
Potentially harmful
Harmful if eatenskin irritant. Wear gloves and other protective equipment when handling Pets: Harmful if eatenskin irritant - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
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
Name Status
Correct
Plant Range
Europe, N America

How to Grow

Cultivation

Grow in any soil in good light. Remove any suckers that grow, which may have long thorns. For more advice see tree cultivation. Has the potential to become a nuisance if not managed well

Propagation

Propagate by seed or from root cuttings or from suckers

Suggested planting locations and garden types

  • Wildlife gardens
  • Architectural
  • Low Maintenance

Pruning

Pruning group 1 for maintaining a neat ball, or Pruning group 7 for pollarding; pruning should be done in late summer or early autumn to prevent bleeding. Suckers should be removed if necessary, in autumn

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus