Acacia binervia

Coast or coastal myall, Rosewood coast, Coastal wattle

Family: Fabaceae subfamily Mimosoideae

This is a shrub or erect or spreading tree from 2 to 16 m high.

The bark is dark brown to grey in colour.

The phyllodes are elliptic to sickle-shaped (falcate) to 15 cm long and about 2 cm wide; and are a striking blue-grey colour.

The cylindrical pale to bright yellow spikes of flowers are very showy and appear in spring from August to October, followed by long seed pods.

Acacia binervia is found in central New South Wales from the Hunter Region south, and to Bungonia in the southwest, and continuing south into Victoria.

It grows in dry sclerophyll forest or heath on rocky slopes, often near streams. It is common in Sydney along the banks of the Georges River on alluvial sands. It also grows in places like the rocky ocean-side hills at Nelson Bay.

In the garden

The flowers are useful to bees in the honey industry.

It is useful as a screen, windbreak or specimen plant and is suitable for coastal locations. It is drought tolerant.

The flowers can be spectacular in some seasons.

Frost tolerance not tested but it does grow in coastal areas prone to frost.

Acacias can suffer from a number of pests, including borers, scale, galls and leaf miners. Growing plants suitable to your local environment minimises these pests occurring.

The foliage is reported to be toxic to stock, the phyllodes containing a glucoside which may produce prussic acid when severed.

Propagation

Propagation is easy done from scarified seed by covering with boiling water for 24 hours and discarding any seeds still floating on the surface.

It is often sold under the common name of ‘Silver Spray’.

Other information

Acacia from Greek acis, meaning a thorn.
binervia refers to the phyllodes having 2, or usually 3-5, prominent longitudinal veins.

Just note that there is also a coastal species in NSW named Acacia binervata which is also a small tree but has really prominent 2-veined phyllodes which are green-grey. It regenerates readily from bushfire through the soil seedbank.

http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Acacia~binervia
https://en.wikipedia.org/wiki/Acacia_binervia

By Jeff Howes