Banksia grandis, commonly known as bull banksia or giant banksia, is a species of common and distinctive tree in the south-west of Western Australia. The Noongar peoples know the tree as beera, biara, boongura, gwangia, pira or peera. It has a fire-resistant main stem with thick bark, leaves with triangular side-lobes, pale yellow flowers and elliptical follicles in a large cone.
Description
Banksia grandis is usually a tree that typically grows to a height of high, sometimes to. It is also found in the form of a stunted, spreading shrub near the south coast, and whenever it occurs among granite rocks. Its trunks are short, stout and often crooked, with the rough grey bark characteristic of Banksia. The leaves are pinnatisect long and wide on a petiole long, with between eight an twelve large triangular lobes on each side of the leaf. The leaves are shiny dark green on the upper surface and softy-hairy underneath. The flowers are borne in a spike that is long and wide at flowering time with hairy involucral bracts up to long at the base of the head. The flowers are pale yellow with cream-coloured styles, the perianth long and the pistil long. Flowering occurs from October to January and the follicles are elliptical, long, high and wide on a massive cone. The old flower fall early and the follicles usually open as they mature. A seedfrom the southcoastraised in Kings Park had retained its spreading habit as at 1981.
Taxonomy and naming
Banksia grandis was first formally described in 1798 by Carl Ludwig Willdenow in the fourth edition of the book Species Plantarum. The specific epithet is a Latin word meaning "great", "large" or "tall". Banksia grandis is a member of Banksia series Grandes, a series containing only B. grandis and the closely related species B. solandri.
Species of nectarivorous birds that have been observed feeding on B. grandis include Anthochaera carunculata. Purpureicephalus spurius has also been recorded feeding upon the seed, as have black cockatoos, though it is not clear which species of black cockatoo was observed, Calyptorhynchus baudinii or C. latirostris.
Uses
Use in horticulture
Bull banksia is not often cultivated and is slow-growing, taking ten years or more to flower from seed. It is very sensitive to dieback and is difficult to grow in regions of summer humidity. It requires a well-drained sandy soil. Seeds do not require any treatment, and take 22 to 42 days to germinate.
The flowers of Banksia grandis were known as mangyt, pulgarla or Bool gal la by the Indigenous peoples who live within its range. The flowers were steeped in water or sucked to obtain nectar.
