Flowering usually takes place from July to November (late winter to early summer) in the golden wattle's native range; because the later buds develop faster, flowering peaks over July and August.  Trees can be harvested for tannin from seven to ten years of age.  The type specimen was collected by the explorer Thomas Mitchell in present-day northern Victoria between Pyramid Hill and the Loddon River. Acacia westoni Maiden, orth. To mark Australia Day in 1990, a 41c stamp labelled "Acacia pycnantha" was issued.  Two fungal species have been isolated from leaf spots on Acacia pycnantha: Seimatosporium arbuti, which is found on a wide range of plant hosts, and Monochaetia lutea.  They are initially bright green, maturing to dark brown and have slight constrictions between the seeds, which are arranged in a line in the pod.
In New South Wales it is especially prevalent around Sydney and the Central Coast region.  It tolerates heavy soils in dry climates, as well as mild soil salinity.
 The larvae of a number of butterfly species feed on the foliage including the fiery jewel, icilius blue, lithocroa blue and wattle blue. Shiny and dark green, these are between 9 and 15 cm (3 1⁄2 and 6 in) long, 1–3.5 cm (1⁄2–1 1⁄2 in) wide and falcate (sickle-shaped) to oblanceolate in shape. In Tasmania it has spread in the east of the state and become weedy in bushland near Hobart. , Acacia pycnantha was first formally described by botanist George Bentham in the London Journal of Botany in 1842.  It is present in California as a garden escapee, but is not considered to be naturalised there.  A. leiophylla has paler phyllodes. It also releases a chemical that prompts other acacia trees nearby to … Propagation is relatively easy by normal seed raising methods following pretreatment by soaking in boiling water or by scarification. Birds facilitate this and field experiments keeping … petiolaris H. Vilm.
Most carried Acacia pollen but virtually all also carried pollen from other genera. , In 1921 Joseph Maiden described Acacia westonii from the northern and western slopes of Mount Jerrabomberra near Queanbeyan in New South Wales.  The mature trees do not have true leaves but have phyllodes—flat and widened leaf stems—that hang down from the branches. One such adaptation is the poisonous alkaloid that the tree pumps into the leaves. It has also naturalised in the NSW Tablelands and in Tasmania so care should be exercised in planting A.pycnantha in areas close to bushland. Other bird species include the silvereye, striated, buff-rumped and brown thornbills.  Birds facilitate this and field experiments keeping birds away from flowers greatly reduces seed production. Acacia pycnantha Benth. 20, "Feeding Australian Acacia Gums and Gum Arabic Leads to Non-Starch Polysaccharide Accumulation in the Cecum of Rats", "The Wedding Dress: Clare Waight Keller for Givenchy", https://en.wikipedia.org/w/index.php?title=Acacia_pycnantha&oldid=986408500, Flora of the Australian Capital Territory, CS1 maint: DOI inactive as of October 2020, Short description is different from Wikidata, Use Australian English from September 2011, All Wikipedia articles written in Australian English, Articles with Encyclopædia Britannica links, Creative Commons Attribution-ShareAlike License, This page was last edited on 31 October 2020, at 17:38.
 They are released in December and January, when the pods are fully ripe. Self-incompatible, Acacia pycnantha cannot fertilise itself and requires cross-pollination between plants to set seed.  Eaten by indigenous Australians, the gum has been investigated as a possible alternative to gum arabic, commonly used in the food industry. These include Uromycladium simplex that forms pustules and U. tepperianum that causes large swollen brown to black galls that eventually lead to the death of the host plant. Similarly, the green and gold colours used by Australian international sporting teams were inspired by the colours of wattles in general, rather than the golden wattle specifically.