Black Locust, False Acacia

Hazard Information

Route: Ingestion     Plant Part: All, especially pods

Scale: Low

Causes weakness, diarrhoea.


Common Name(s)

Black Locust, False Acacia

Latin Name

Robinia pseudoacacia




Native to South-East USA, however has been successfully planted around the world and considered invasive in some areas.


Thick, blackish bark. The leaves are 1025 cm long, pinnate with 919 oval leaflets, 25 cm long and 1.53 cm broad. Each leaf usually has a pair of short thorns at the base. The intensely fragrant flowers are white, borne in pendulous racemes 820 cm long, and are considered edible. The fruit is a legume 510 cm long, containing 410 seeds.



Entire plant is toxic, pods are considered more concentrated part. Ripens autumn time and remains until spring. Pods may be edible when subjected to cooking however this is currently unprooven.


Weakness and diarrhoea, symptoms worsened in animals.

Flowering Period

May - June, after leaves. Short blooming period (10 days)


Tropical countries and garden centres.