Background: Acacia belongs to the Leguminosae family which also includes Powder Puff, Brazilian Rain Tree and Tamarind among others. There are over 1000 species of Acacia trees and shrubs found mostly in sub-tropical and tropical areas, most commonly Australia and Africa. Australian species do not do as well in high humidity climates. When seen in nature at maturity, the Acacia has few if any lower branches and a spreading crown.

Features: Most Acacia have yellow flowers, but a few have almost white flowers. Some flowers form tight balls and others resemble the Powder puff. Most develop seed pods.

Sweet Acacia is a thorny plant with delicate compound leaves, colorful yellow flowers and brown fruit pods.

Thornless Acacia (Tamarindillo) has long, thich, pinnate, dark green leaflets. It is native to the Florida Keys, Bahamas and Cuba. It makes a beautiful tree that resembles the Tamarind. It is hardy only in zones 10-11.

Bullhorn is distinctive because of the large, impressive thorns. These swollen thorns also have a symbiotic relationship with ants. The trees provide nectar to the ants, and the ants protect the tree from invasive plants and pests. The ants also reside in the thorns which become hollow with age. This species is native to South Africa and Central America.

 

Styles / Pruning / Training: To mimic the tree growing in nature, grow a large spreading canopy. The tree breaks new buds easily from the trunk so other styles are possible. Be careful not to shade lower branches or they will die back.

Both the roots and the top foliage can be heavily pruned. It is best to prune after blooming. Keep in mind that the leaves are compound so only cut at a joint not the leaflet. Wire with caution because the bark is delicate and can scar easily. It is a good idea to wrap the branch before wiring or use tie-downs instead.

 

Light / Water requirements: The Acacia prefers full sun but can be grown in morning sun. Allow the surface of the soil to dry between waterings. It will usually lose its leaves if left dry for too long.