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 there has been disagreement over the way this should be done. As of 2017, it is widely (but not completely) accepted that the section that includes the majority of the Australian species (including this one) should retain the name Acacia, whilst other sections of the genus should be transferred to the genera Acaciella, Mariosousa, Senegalia and Vachellia[].

Common Name:

General Information

Acacia concurrens is a usually single-stemmed tree that can grow up to 10 metres tall[]. Although it produces true leaves as a seedling, llike most members of this section of the genus, the mature plant does not have true leaves but has leaf-like flattened stems called phyllodes[].
The plant is harvested from the wild for local use as a source of materials. It is sometimes used in mine site reclamation projects

Known Hazards

Especially in times of drought, many Acacia species can concentrate high levels of the toxin Hydrogen cyanide in their foliage, making them dangerous for herbivores to eat.

Botanical References

Range

Australia - northern New South Wales, southern Queensland

Habitat

Found in eucalypt forest and woodland, also as regrowth in heath, on hillsides or plateaux in sandy soils or sandy loam, often over shale[].

Properties

Medicinal Rating
Other Uses Rating
Habit	Tree
Height	8.00 m
Growth Rate	Fast
Pollinators	Insects
Cultivation Status	Wild

Cultivation Details

Acacia concurrens is a tree of the warm, humid climate of warm temperate to subtropical regions of eastern Australia. It is unlikely to tolerate more than short-lived, light frosts[]. It experiences a mean annual rainfall in the region of 900 - 1,200mm, fairly evenly diistributed[].
Requires a sunny position and a well-drained soil. Found in soils that are often sandy, but include brown clay loams and black sandy loams[].
A fast-growing tree that can increase in height by up to 2.5 metres a year when young[].
Acacia concurrens together with Acacia crassa , Acacia leiocalyx and Acacia longispicata constitute a group of closely interrelated and taxonomically ‘difficult’ species belonging to the often confused and poorly defined ‘Acacia cunninghamii group’[].
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[].

Edible Uses

None known

Medicinal

The bark of all Acacia species contains greater or lesser quantities of tannins and are astringent. Astringents are often used medicinally - taken internally, for example. they are used in the treatment of diarrhoea and dysentery, and can also be helpful in cases of internal bleeding. Applied externally, often as a wash, they are used to treat wounds and other skin problems, haemorrhoids, perspiring feet, some eye problems, as a mouth wash etc[, ].
Many Acacia trees also yield greater or lesser quantities of a gum from the trunk and stems. This is sometimes taken internally in the treatment of diarrhoea and haemorrhoids[].

Agroforestry Uses:

A useful plant for site rehabilitation after sand mining[].

Other Uses

The bark contains around 9% tannins[]. Bark harvested for its tannins should only be taken from mature stems, and only when the sap is rising at the beginning of the growing season - which is when the tannin content is highest and the bark is most easily removed from the wood[].

The plant yields a gum[].

The wood is close-grained and takes a good polish. It is dark coloured and heavy, and a useful wood for cabinet purposes. It reminds one very much of Red Cedar, but it is rather heavier. It is very homogeneous[].
The wood should be suitable for fuel[].

Propagation

Seed - best sown as soon as it is ripe in a sunny position in a warm greenhouse[].The dried seed of most, if not all, members of this genus has a hard seedcoat and may benefit from scarification before sowing to speed up germination. This can usually be done by pouring a small amount of nearly boiling water on the seeds (being careful not to cook them!) and then soaking them for 12 - 24 hours in warm water. By this time they should have imbibed moisture and swollen - if they have not, then carefully make a nick in the seedcoat (being careful not to damage the embryo) and soak for a further 12 hours before sowing. Sow the seed in Spring in a greenhouse. 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.
Acacia seeds that have matured fully on the bush and have been properly dried have a hard seed coat and can be stored in closed containers without deterioration for 5 - 10 years or more in dry conditions at ambient temperatures. It is best to remove the aril, which attracts weevils and can lead to moulds forming. The arils are easilyremoved by placing the seeds in water and rubbing them between the hands, then drying the seeds and winnowing them[].