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Banksia rosserae is a recently described multi-stemmed shrub from inland Western Australia, known only from about 27 plants near Mount Magnet. It is poorly known in cultivation, and growers should treat it as an experimental plant.
Banksia rosserae is a recently described species of Banksia. Endemic to inland Western Australia, it is the only Banksia species to occur solely within the arid zone.
The species was originally discovered in September 2000 by John Cullen on an "orange sand dune". In 2001, Peter Olde and Neil Marriott, along with Keith Alcock, visited the area, and Alcock discovered the specimens. In January 2002, Kevin Collins and John Cullen discovered six more plants around 20 kilometres (12 mi) from the first discovery for a total of 27 plants. It wasn't until 2006, after a rain, that the plants flowered.
Banksia rosserae is poorly known in cultivation as yet. In 2003, Kevin Collins reported that "early trials have proven good seed viability and rapid young seedling development". The following year Neil Marriott reported that "seedlings germinate well with smoked water during spring, and young plants establishing here in deep granite sands and sandy loams at Stawell are growing slowly but steadily." It was his view that the species was likely to be of value to the cut flower industry, and as a garden plant in hot dry climates.
Banksia rosserae is known only from an area south-south-east of Mount Magnet in inland Western Australia. There are 27 plants known, all occurring within a radius of about 20 kilometres (12 mi). The area is around 200 kilometres (125 mi) from where other Banksia species are known to occur, representing "a significant extension of range into the arid zone and a significant geographic disjunction for the genus."
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
Text excerpted from the Wikipedia article Banksia rosserae by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
