Cultivation
Banksia menziesii has several horticultural features including patterned buds and follicles, attractive pinkish new growth, and showy flowerheads. A dwarf form is commonly sold in nurseries. Byron Lamont has observed that dwarf plants may grow into taller single-trunked plants in cultivation.
The plant is fairly easy to grow in a mediterranean climate with good drainage and a light (sandy) soil; however, with medium to high susceptibility to Phytophthora cinnamomi dieback, it is unreliable in conditions which favour the growth of the soil-borne water mould, such as summer humidity or poor drainage. The use of phosphite fungicides does reduce the spread of Phytophthora. It generally does poorly in eastern Australia, although it is grown commercially in southeastern South Australia as a cut flower crop. It is also grown in California and Hawaii.
Seeds do not require any treatment prior to planting, and take 26 to 40 days to germinate. Seeds that grow into yellow-flowered plants are pale and unpigmented, while future bronze- and red-flowered plants are dark greyish and black respectively. It generally takes about five to seven years to flower from seed. The plant favours sandy well-drained soils and a sunny position and can be heavily pruned if necessary, as new growth can arise from the lignotuber. Although it is readily propagated by seed, experiments with in vitro propagation found Banksia menziesii to be more difficult than other species trialled.
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