Sweet Thorn, Karroo Thorn

Acacia karroo

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



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Flowers are fragrant

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Where to Grow:

Unknown - Tell us


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)


24-36 in. (60-90 cm)


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:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

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

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds


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

Phoenix, Arizona

La Mirada, California

Rock Hill, South Carolina

Gardeners' Notes:


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.