Alien Invasives

Black Wattle (Acacia mearnsii)


01 October 2016

Black Wattle (Acacia mearnsii)

Medium evergreen tree, 5 to 10m tall with dark olive-green, finely hairy leaves. Abundant pale yellow or cream spherical flowers in large fragrant sprays from August to September. Fruits are dark brown, finely haired pods.

Other names
Swartwattel (Afrikaans)
Invasive status
NEMBA Category 2
CARA 2002 Category 2

Black Wattle
Originally from
South-eastern Australia and Tasmania
Where is it a problem?
Throughout the Western Cape, Eastern Cape, Kwa-Zulu Natal, Mpumalanga and Gauteng
How does it spread?
Seed dispersal and suckers
Why is it a problem?
Competes with and replaces indigenous grassland and riverine species. Grasslands are invaded by dense thickets of black wattle, which reduced the grazing area for domestic and wild animals.
Planting alternatives
Weeping Wattle (Peltophorum africanum), Hook Thorn Acacia (Acacia caffra), Karee (Searsia lancea), Mountain Karee (Searsia leptodactyla)
Leather tanning and firewood

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