Robinia pseudoacacia – Black locust, False Acacia

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Fabaceae

Robinia pseudoacacia – Black locust, False Acacia

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Fast-growing tree with an irregular oval to rounded, transparent crown. Height 20 - 25 m, width approx. 12 - 18 m. The greyish brown bark is rough and deeply grooved. Young twigs are olive-green to brown. The branches bear sharp thorns approx. 3 cm long. The imparipinnate leaves consist of 9 to 19 elliptical, dark bluish green leaf segments that are 1.5 – 4.5 cm in size. Robinia leafs out late and keeps its leaves long into the autumn. The autumn colour is yellow. Compact, pendulous clusters of creamy white, sometimes slightly pink, aromatic flowers appear in June. These are followed by flat, reddish brown, leathery pods with a winged edge that often stay on the tree throughout the entire winter. This tree has shallow roots and grows well in light, calcareous soil. It forms many underground runners.
Our trees can only be planted when they don't have any leaves. Due to the this we will start delivering again from November 2024.
Availability
Clear stem (4)
Specifications
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Height
20 - 25 m, fast growing
Crown
oval to round, transparent, half-open crown, capricious growing
Bark and branches
greyish brown, roughly grooved, twigs olive-green to brown with small thorns
Leaf
imparipinnate, 20 - 30 cm, 9 to 19 leaf segments, 1.5 – 4.5 cm, green, feathered leaf
Flowers
pendulous clusters up to 15 cm, cream♂ white, approx. 2 cm, aromatic, June, fragrant flowers
Fruits
flat, leathery pod, reddish brown, 5 -10 cm long, remains on tree a long time
Spines/thorns
Yes
Toxicity
has toxic components
Soil type
places little demands on soil, provided there is good drainage
Soil moisture
suitable for dry soil
Paving
tolerates paving
Winter hardiness zone
5a (-28,8 to -26,1 °C)
Wind resistance
moderate, particularly in rich soil
Other resistances
resistant to frost (WH 1 - 6), resistant to de-icing salt
Fauna tree
valuable for bees (honey plant), valuable for butterflies
Application
avenues and broad streets, industrial areas
Shape
clearstem tree, multi-stem treem
Origin
eastern and central part of the USA
Clear stem tree Multi-stem tree calcareous soil clay soil loamy soil nutrient-poor soil sandy soil tolerates paving light-loving resistant to de-icing salt resistant to frost (WH 1 - 6) suitable for dry soil oval 1st size , taller than 12 metres half-open crown green white June late sprout fast growing Conspicuous bloom Feathered leaf valuable for bees (honey plant) valuable for butterflies toxic components Capricious growing Fragrant flowers yes Tree for the future
Applications and inspiration
Trees for bees: the right species
Related projects
Waterside Campus - University of Northampton
National Gallery - Copenhagen
Pairi Daiza - Brugelette
Frequently asked questions
Robinia pseudoacacia

Robinia pseudoacacia can eventually reach a height of 20 - 25 m, fast growing, depending on the site and climate conditions.

Robinia pseudoacacia is fast growing and can eventually reach a height of 20 - 25 m, fast growing, depending on the site and climate conditions.

The right time to plant Robinia pseudoacacia is during the dormancy period. In Western Europe, Robinia pseudoacacia with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

Robinia pseudoacacia blooms in june.
General