Propagation
Fresh seed should be sown in a well-drained media and the kept moist but not wet. Maintain a temperature of 18º to 21º C. (64º to 75º F) in an unheated glasshouse or open frame. Germination occurs within 3-weeks to 3-months depending on the species, then prick out and pot up.
Careful not to over water seedlings, as they are prone to damping off and larger plants are difficult to transplant. When removing seed from Banksia fruits it may be necessary to place the fruit in an oven for 60 minutes at a temperature of 120° C. to simulating the effect of a bushfire to opening the valves.
Note:
The seeds of this tree require no pretreatment and germinate in 21 to 35 days.
General pruning information
When pruning reduce only the new growth as cutting old wood is likely to cause dieback. Limbs may be removed back to the collar.
Cultivation
Generally, Banksia species prefer a well drained, sandy soil that is tending acidic but many species from Western Australia grow on acidic top soils with alkaline subsoil. When the growing Western Australian species outside their native habitat technique of building a garden bed, of acidic soil above a layer of agricultural lime commonly produces better results particularly in raised garden beds or on slopes. During establishment, keep the soil moist but not wet and do not use fertiliser that contains phosphorus.
Botanic information
Leaf: The dark green stiff leathery textured broad linear leaves are up to 270 mm (11 in) long by 20 mm (µ in) wide with undulating dentate margins made up of triangular lobes. The young leaf surface is covered in tomentum becoming glabrous-waxy with age and the apex is obtuse. The underside is dull pale green and the prominent midrib is yellowish.
Flower: The cream-orange tubulate flowers have straight perianth segments that are up to 37 mm (1½ in) long and are had covered in tomentum. The glabrous pistil is up to 45 mm (1µ in)long. They are arranged in a erect terminal ovoid spike that is 70 mm to 150 mm (6 in) tall with bracts at its base and appear above the foliage from midsummer to winter. They are pollinated by birds and an important source of food for Honeyeaters.
Fruit: There are up to 60-embedded elliptical-oblong follicles to 20 mm (µ in) long by 6 mm (¥ in)high and 11 mm (? in)wide and contained 2-seeds. They are smooth mottled and beaked and are arranged in a villous spike which is persistent of the plant. The follicles open after fire and release blackish wedge shaped (cuneate) seeds with a body up to 10 mm (? in ) long by 6 mm (¥ in) wide and have a curved membranous wing.