SweetThorn Information. In their native South Africa, Acacia karoo trees are beneficial wildlife trees. Birds nest in them and the flowers attract insects to feed the birds. Sweetthorn is an attractive and fragrant tree native to South Africa. Read this article to find out more about this lovely landscape tree that grows well under the most difficult Southwestern conditions. Pin by Amin Ranzoor on Plants and trees | Acaciatree, Beautiful tree, Tree. Thornacacia, also called white acacia, is a fast-growing deciduous tree or shrub of the leguminous family, Czech Republic.Acaciasweetthorn in the Karoo Stock Photo. Acacia nilotica, babul tree, flower, stem, leaves. ACACIA KARROO – SweetThorn Height: 12 – 20m Bloomtime: Summer Water: Medium to Low Maintenance: Low Sun: Full Sun Please phone us on 023 230 0694 or email us at plants@tulbaghnursery.co.za to confirm stock availability. The iconic, flat-topped African Acacia (Nyanga Flat - Top) is called Vachellia abyssinica. The dome-shaped Vachellia erioloba, known as the Giraffe Thorn or Camel Thorntree, is the most recognizable tree in the Kalahari desert, and occurs widely in the drier areas in Southern Africa. A well-known thorntree of the veld, this fast growing, drought resistant tree has rather sparse foliage in a rounded crown. It bears sweetly scented, golden-yellow mimosa-like balls of flowers several times during summer. Acacia Karoo has a rounded crown, branching fairly low down on the trunk. It is variable in shape and size, reaching a maximum of about 12m where there is good water. The bark is red on young branches, darkening and becoming rough with age. RFFBA5YN–SweetThorntree, Acacia karroo, common in drier parts of Southern Africa.RF2BDFBTR–Butterfly sitting on the yellow flowers a SweetThorn or Acacia karoo tree. 2. Acacia/SweetThorn/Vachellia Karroo. The acacia is one of South Africa’s most well-known trees. There are over 1,300 species of acacia worldwide, making it quite diverse.