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[].
This species is closely related to Acacia pravissima[].

Common Name: Knife-Leaf Wattle

General Information

Acacia cultriformis is an erect or spreading, much-branched shrub that can grow up to 4 metres tall365]. 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 food and a dye. It has been used in soil stabilization projects in Iraq. A very ornamental plant, especially when in flower, it is often grown in gardens and makes an excellent, intruder-proof hedge.

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

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Range

Australia - New South Wales and Queensland.

Habitat

Rocky ridges[]. Dry sclerophyll forests and heath[]. Grows in sand or clayey loam in Eucalyptus communities[]. Woodland, heath and mallee, often in rocky sites[].

Properties

Edibility Rating
Other Uses Rating
Habit	Evergreen Shrub
Height	4.00 m
Pollinators	Insects
Cultivation Status	Ornamental, Wild

Cultivation Details

Acacia cultriformis is native to the warm temperate zone of southeast Asia and requires winters that are mild and do not experience many frosts. It is said to be able to tolerate occasional frosts to as low as -7°c, and has been reported as having been grown as far north as southern England in the past[].
Prefers a well-drained sandy loam and a very sunny position[]. Succeeds in dry soils and is drought tolerant once established. Succeeds in any good garden soil that is not excessively limey[]. Most species become chlorotic on limey soils[].
An ornamental species, with at least one named cultivar.
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

Flowers - cooked[]. Rich in pollen, they are often used in fritters.

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:

Plants are heavily armed with thorns and make a good screen or hedge in warm temperate areas[].
The cultivar 'Austriflora Cascade' is a prostrate, ground cover[].
The plant has been grown in southern Iraq in order to control soil erosion[].

Other Uses

A yellow dye is obtained from the flowers[].
A green dye is obtained from the seed pods[].
The wood is used for production of textile dye[].

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[].
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[].