A researched TAFE plant identification study record for Banksia marginata, the Silver Banksia, a highly variable species native to south-eastern Australia.

Identification

Habit ranges from low, spreading shrub to small or medium tree. Adult leaves are narrow and usually 15–60 mm long, dull green above and conspicuously white or silver beneath. Margins are often rolled under and may be entire or toothed, especially toward the tip or on juvenile growth. Pale-yellow cylindrical flower spikes develop into woody infructescences bearing follicles.

Distribution and fire response

The species occurs naturally in New South Wales, Victoria, Tasmania and South Australia across coastal heath, forest, woodland, dunes and other habitats. This broad range explains much of its variation. Populations also differ in fire strategy: some plants regenerate only from seed, while lignotuber-bearing forms can resprout after damage. A specimen's provenance therefore matters when interpreting both form and cultivation performance.

Cultivation and ecology

Use full sun or dappled shade and avoid persistently saturated soil. Select locally appropriate forms rather than assuming all provenances behave identically. Pale flower spikes supply nectar and pollen to native fauna, and the woody follicles often remain visible well after flowering. Plants can be raised from seed; cuttings are useful when a particular form must be retained.

Study distinction

The silvery leaf underside is the quickest clue behind the common name. Compare carefully with other narrow-leaved banksias: leaf size, tip, arrangement, flower-spike dimensions and provenance are more dependable together than any single character.