Acacia obtusifolia grows to a large-shrub or small tree, to 8 m high, usually on sandy and sandstone substrates but also on basalt. It grows in wet and dry sclerophyll forest and margins of rainforest, woodland and heath. It is found chiefly in the coastal subdivisions and into the tablelands, extending to the central western slopes. It extends into Queensland and NSW.
The phyllodes (modified leaves) are narrowly elliptic to linear, to 20 cm long and 3 cm wide with prominent longitudinal veins and a blunt apex.
The pale-yellow to cream-coloured flowers, are produced in spikes (cylindrical heads) up to 5 cm long, produced singularly or pairs (1s and 2s) in the phyllode axils.
Flowering is in summer.
Seed pods are straight, to 15 cm long and 0.5 mm wide.
Currently, not much is known about its cultivation. It is very morphologically similar to Acacia longifolia which is known to grow well in gardens and landscapes, at least for several years.
It likely needs a well-drained soil to do well and a semi-sunny position
Acacias can suffer from a number of pests, including borers, scale, galls and leaf miners. Growing plants suitable to your local environment minimises these occurring.
Propagation is easy from scarified seed by covering with boiling water for 24 hours and discarding any seeds still floating on the surface.
Very morphologically similar to Acacia longifolia, which it can be confused with. The two species flower at different time with A. longifolia flowering in late-winter / spring and A. obtusifolia flowering in summer. A. obtusifolia also has resinous phyllode margins.
Most wattles regenerate from seed after fire with some species exhibiting suckering from the bases.
Acacia – from Greek acis, a thorn.
obtusifolia – refers to the blunt (obtuse) tip / apex of the leaf.
Not considered at risk in the wild and is widespread.