About

Banksia oblongifolia, commonly known as the fern-leaved, dwarf or rusty banksia, is a species in the plant genus Banksia. Found along the eastern coast of Australia from Wollongong, New South Wales, in the south to Rockhampton, Queensland, in the north, it generally grows in sandy soils in heath, open forest or swamp margins and wet areas. A many-stemmed shrub up to 3 m (9.8 ft) high, it has leathery serrated leaves and rusty-coloured new growth. The yellow flower spikes, known as inflorescences, most commonly appear in autumn and early winter. Up to 80 follicles, or seed pods, develop on the spikes after flowering. Banksia oblongifolia resprouts from its woody lignotuber after bushfires, and the seed pods open and release seed when burnt, the seed germinating and growing on burnt ground. Some plants grow between fires from seed shed spontaneously.

How to grow it

Conrad Loddiges and his sons wrote of Banksia oblongifolia in volume 3 of their work The Botanical Cabinet in 1818, reporting it had been brought into cultivation in 1792, though had been initially and incorrectly called Banksia dentata. It flowered in November in the United Kingdom, and was grown in a greenhouse over winter.

Not commonly cultivated, it adapts readily to garden conditions and tolerates most soils in part-shade or full sun. The colours of the inflorescences in bud, and timing of flowers into winter give it horticultural value, as does its reddish new growth. Larger plants have taller flower spikes. It is propagated readily from seed, with young plants taking five to seven years to flower from seed. Pruning can improve the shrub's appearance, and it is a potential bonsai subject.

Where it grows

Banksia oblongifolia occurs along the eastern coast of Australia from Wollongong, New South Wales, in the south to Rockhampton, Queensland, in the north. There are isolated populations offshore on Fraser Island, and inland at Blackdown Tableland National Park and Crows Nest in Queensland, and also inland incursions at the base of the Glasshouse Mountains in southern Queensland, at Grafton in northern New South Wales, and Bilpin and Lawson in the Blue Mountains west of Sydney. B. oblongifolia grows in a range of habitats—in damp areas with poor drainage, along the edges of swamps and flats, as well as wallum shrubland, or coastal plateaux. It is also found in open forest or woodland, where it grows on ridges or slopes, or heath. Soils are predominantly sandy or sandstone-based, though granite-based and clay-loams are sometimes present.

Other Banksia plants

Banksia acanthopoda · Prickly Banksia · Banksia acuminata · Wallum Banksia · Banksia alliacea · Cactus Dryandra · Northern Banksia · Yilgarn Dryandra · Banksia archaeocarpa · Banksia arctotidis · Banksia armata var. armata · Banksia armata var. ignicida