Vachellia farnesiana (Mimosa Bush)

Scientific Name

Vachellia farnesiana (L.) Wight & Arn.

Common Names

Mimosa Bush, Needle Bush, Cassie, Cassie Flower, Ellington Curse, Fragrant Acacia, Farnese Wattle, Huisache, Ironwood, Mimosa Bush, Opopanax, Prickly, Prickly Moses, Prickly Mimosa, Scented Wattle, Sweet Acacia, Sweet Wattle, Thorny Acacia, Yellow Mimosa, Briar Bush, Dead Finish, Downs Mimosa, False Mesquite, Mimosa Wattle, Perfumed Wattle, Sponge Flower


Mimosa farnesiana, Acacia farnesiana, Acacia minuta, Acacia smallii, Pithecellobium minutum, Vachellia densiflora

Scientific Classification

Family: Fabaceae
Subfamily: Mimosoideae
Tribe: Acacieae
Genus: Vachellia


Color: Yellow to orange
Bloom Time: Autumn through to spring


Vachellia farnesiana is a spreading shrub that grows up to 9.8 feet (3 m) tall. Branches are usually grey-brown with prominent white spots and grow in a zigzag shape. The yellowish-green to pure green leaves are ferny, with 1 to 6 pairs of leaf "branches," each with 5 to 20 pairs of narrow, rounded, and up to 0.3 inches (8 mm) long leaflets. Thorns are found in pairs at each leaf's base and grow up to 4 inches (10 cm) long. The golden yellow to orange flowers are ball-shaped, up to 0.4 inches (1 cm) wide, and appear on stalks. Flowering occurs throughout the year but is most abundant from autumn through to spring.

Vachellia farnesiana - Mimosa Bush

How to Grow and Care

Acacia requires full sunlight and grows in nearly any soil, including sand, clay, or soil that is highly alkaline or acidic. Although Acacia prefers well-drained soil, it tolerates muddy soil for short periods. Acacia is a plant-it-and-forget-it type of tree, although a young tree may need protection from wildlife while developing its defense system. During the first year, the tree benefits from an orchid fertilizer every three to four weeks. After that time, you can feed the tree a general-purpose fertilizer once every year, but it isn't an absolute requirement. Acacia requires little or no water.

Acacia may need occasional pruning during the dry months. Avoid pruning leafy, green areas, and trim only dead growth.

Although the tree is disease-resistant, it can sometimes be affected by a fungal disease known as anthracnose. Additionally, watch for pests such as aphids, thrips, mites, and scale. See more at: How to Grow and Care for Acacia.


Native to southern United States, Mexico, Central America, the Caribbean, and northern South America.


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