Seeds are able to persist in the soil for more than five years, germinating after fire. (misapplied) Acacia petiolaris Lehm.  The bark is generally dark brown to grey—smooth in younger plants though it can be furrowed and rough in older plants. , The species has become naturalised beyond its original range in Australia. Acacia pycnantha, most commonly known as the golden wattle, is a tree of the family Fabaceae native to southeastern Australia.  Acacia obliquinervia has grey-green phyllodes, fewer flowers in its flower heads, and broader (1.25–2.5 cm (1⁄2–1 in)-wide) seed pods. 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. The ability of an animal or plant species to survive in a particular environment, due to physiological, behavioural or structural changes which are passed down the the next generation. In New South Wales it is especially prevalent around Sydney and the Central Coast region. This discourages the animals from eating the leaves.  Field observations at Hale Conservation Park show the bulk of new growth to take place over spring and summer from October to January.  The bright yellow inflorescences occur in groups of 40 to 80 on 2.5–9 cm (1–3 1⁄2 in)-long racemes that arise from axillary buds.  The species has a degree of frost tolerance and is adaptable to a wide range of soil conditions, but it prefers good drainage. The 1970 Monty Python's Flying Circus Bruces sketch includes a reference, by one of the stereotyped Australian characters, to "the wattle" as being "the emblem of our land", with suggested methods of display including "stick[ing] it in a bottle or hold[ing] it in your hand" - despite the wattle prop itself being a large, forked branch with sparse patches of leaves and generic yellow flowers.
It is quick growing and will often flower in the second season after sowing.
It is suited to a wide range of soil types, provided they are not waterlogged, and a position in full sun or light shade.
 Several species of honeyeater, including the white-naped, yellow-faced, New Holland, and occasionally white-plumed and crescent honeyeaters, and Eastern spinebills have been observed foraging.  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. An understorey plant in eucalyptus forest, it is found from southern New South Wales and the Australian Capital Territory, through Victoria and into southeastern South Australia. pycnantha Acacia pycnantha Benth var. Most carried Acacia pollen but virtually all also carried pollen from other genera.  It can suffer yellowing (chlorosis) in limestone-based (alkaline) soils. This was proclaimed by Governor-General Sir Ninian Stephen in the Government gazette published on 1 September.
The bright yellow flowers occur in the axils of the phyllodes as 20 or more globular-shaped clusters.  However, the pollen is too dry to be collected by bees in dry climates.
Other bird species include the silvereye, striated, buff-rumped and brown thornbills. , The Australian Coat of Arms includes a wreath of wattle; this does not, however, accurately represent a golden wattle. Bees did take secretions from the extra-floral nectaries as well as Blue-tongued skinks make-up the Australasian genus of Tiliqua, which contain some of the biggest members of the skink family. Flowering is mainly in late winter and spring. Acacia pycnantha, also known as the golden wattle, is a tree of the family Fabaceae which grow in southeastern Australia. , Outside Australia it has become naturalised in South Africa, Tanzania, Italy, Portugal, Sardinia, India, Indonesia and New Zealand.  A. saligna has longer, narrower phyllodes. His colleague Richard Hind Cambage grew seedlings and reported they had much longer internodes than those of A. pycnantha, and that the phyllodes appeared to have three nectaries rather than the single one of the latter species. In Western Australia, it is found in the Darling Range and western wheatbelt as well as Esperance and Kalgoorlie. , Clare Waight Keller included golden wattles to represent Australia in Meghan Markle's wedding veil, which included the distinctive flora of each Commonwealth country..