Cultivation
Banksia grossa is cultivated for its attractive needle-like leaves and rusty-brown flower spikes, both of which can be quite variable in colour. This species favours well-drained sandy or loamy acidic soils with a pH of 5.5 to 7, and a sunny aspect. Once established, it tolerates dry spells. It can be pruned heavily as it resprouts from its lignotuber.
Propagation is by seed. The seeds do not require any treatment before sowing, and take around 14 days to germinate. This is a slow-growing plant, taking 5 to 7 years to reach maturity and begin flowering.
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