Classification of the genus Acacia (in the wider sense) has been subject to considerable debate. It is generally agreed that there are valid reasons for breaking it up into several distinct genera, but disagreement in the way this should be done. Some authorities have wanted to transfer this species to the genus Racosperma, but the latest decision (in 2011 and still not fully accepted) is that it remains in Acacia[
This species is closely related to Acacia dealbata[
]. Hybrids between Acacia baileyana and Acacia decurrens are common[
Acacia angulata Desv.
Mimosa angulata (Desv.) Poir.
Mimosa decurrens Bojer
Mimosa decurrens Donn
Mimosa decurrens J.C.Wendl.
Racosperma decurrens (Willd.) Pedley
Common Name: Green Wattle
Acacia decurrens is an evergreen shrub or small tree, usually growing no more than 10 metres tall, though larger specimens are known[
The plant is harvested from the wild for local use as a food, medicine and source of materials. It is grown as an ornamental, valued especially for its floral display.
Australia - New South Wales, Tasmania, Victoria.
Sheltered forests, mainly on shales and sandstone[
]. Usually on cool moist hills and gullies[
]. Grows in open forest or woodland, on hillsides or gullies, usually on shale[
|Other Uses Rating||
|Cultivation Status||Ornamental, Wild
Acacia decurrens is a plant of the warm temperate and subtropical zones, where it is found at elevations up to 2,500 metres. It grows best in areas where annual daytime temperatures are within the range 12 - 25°c, but can tolerate 6 - 30°c[
]. When dormant, the plant can survive temperatures down to about -5°c, but young growth can be severely damaged at 0°c[
]. It prefers a mean annual rainfall in the range 900 - 2,600mm, but tolerates 750 - 3,000mm[
]. This species is one of the hardiest members of the genus, it succeeds outdoors in areas where frosts are mild and only experienced occasionally - in areas close to its climatic limits it tends to do best when grown in coastal gardens in a sunny, sheltered position that is protected from the wind[
]. It can resprout from the base if cut bck by frost[
]. It requires hot, sunny summers if it is to ripen its wood fully and flower freely.
Prefers a freely-draining, light sandy loam and a very sunny position sheltered from strong winds[
]. Prefers a pH in the range 5 - 6.5, tolerating 4.5 - 7[
]. Succeeds in any good garden soil that is not excessively limey[
], it also succeeds in dry soils. Most species in this genus become chlorotic on limey soils[
A fast-growing and very ornamental tree[
The cultivar 'Mollis' is notably resistant to honey fungus[
This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[
Flowers - cooked[
]. Rich in pollen, they are often used in fritters.
A gum that exudes naturally from the trunk is edible and is used as a substitute for Gum Arabic in making jellies etc[
]. It is insoluble in water[
] and is of low quality[
]. Larger quantities can be obtained by tapping the trunk[
]. Some species produce a gum that is dark and is liable to be astringent and distasteful, but others produce a light gum and this is sweet and pleasant. It can be sucked like candy or soaked in water to make a jelly.[
]. The gum can be warmed when it becomes soft and chewable[
The bark is astringent[
]. It should be stored for 12 months before being used[
]. Its main use is in the treatment of diarrhoea[
The extensive root system of this plant helps to prevent soil erosion[
Often grown as a screen in Australia[
A yellow dye is obtained from the flowers[
A green dye is obtained from the seed pods[
The bark contains about 40% tannin[
]. On a 10% moisture basis, the bark contains 36.6% tannin[
Seed - best sown as soon as it is ripe in a sunny position in a warm greenhouse[
]. Stored seed should be scarified, pre-soaked for 12 hours in warm water and then sown in a warm greenhouse in early spring. The seed germinates in 3 - 4 weeks at 25°c[
]. As soon as the seedlings are large enough to handle, prick them out into individual pots and grow them on in a sunny position in the greenhouse for their first winter. Plant them out in late spring or early summer, after the last expected frosts, and consider giving them some protection from the cold for their first winter outdoors.
Cuttings of half-ripe wood with a heel, mid summer in individual pots in a frame[
]. Overwinter in a greenhouse for the first winter and plant out in their permanent positions in late spring or early summer. Fair percentage[