Photo by Melody

PlantFiles: Sweet Thorn, Karroo Thorn
Acacia karroo

Family: Mimosaceae
Genus: Acacia (a-KAY-see-uh) (Info)
Species: karroo

One member has or wants this plant for trade.


under 6 in. (15 cm)
6-12 in. (15-30 cm)
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)
12-15 ft. (3.6-4.7 m)
15-20 ft. (4.7-6 m)

Unknown - Tell us

USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Full Sun

Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:
Bright Yellow

Bloom Time:
Late Spring/Early Summer

Grown for foliage

Other details:
This plant is attractive to bees, butterflies and/or birds
Flowers are fragrant
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; winter sow in vented containers, coldframe or unheated greenhouse

Seed Collecting:
Unknown - Tell us

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to view:

By AlexK
Thumbnail #1 of Acacia karroo by AlexK

By kennedyh
Thumbnail #2 of Acacia karroo by kennedyh

By kennedyh
Thumbnail #3 of Acacia karroo by kennedyh

By Little_things
Thumbnail #4 of Acacia karroo by Little_things


No positives
1 neutral
No negatives

Gardeners' Notes:

Neutral proff72 On Apr 2, 2007, proff72 from Pretoria
South Africa wrote:

I live in central South Africa and trees like these are abundant. Very easily grown from seeds, very drought resistant and flourish in summer rainfall regions. This is a pioneer tree, fast grower and estimated lifetime is a mere 10 to 15 years. As with all thorn trees be sure to prune carefully because of the thorns. Branches tend to grow downward or hang as tree gets bigger. I usually just cut these off, mimicking nature where antilope usualy does the pruning. In the wild they grow either far apart or very near to eachother, so if you want to plant them for shade plant a couple a few feet apart. Be careful when tree starts leaking sap - this could indicate a worm atacking the core of the tree.


This plant has been said to grow in the following regions:

Phoenix, Arizona
La Mirada, California
Rock Hill, South Carolina

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