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Characteristics: Tree to 30 m spread 4 m
Seed per packet: 10
Greviilea robusta is very ornamental and fast growing upright tree that is one of the easiest Grevillea's to grow. In this tree's native environment it can grow to the 30 metres but in cultivation usually less than half that size.
Fern like leaves with a slivery underside which are almost hidden by the masses of golden yellow orange flowers in late spring. Truly a spectacular tree in flower.
Prized for its beautiful timber that is used in furniture making.
Native to eastern Australia.
Prefers medium to heavy soils in an open sunny position, drought resistant but frost tender.
Although seed can be sown most of the year in Australia seed is generally best sown in spring or autumn in temperate climates, avoid the coldest and hottest months of the year. The optimum germination temperature for germination is around 18-22°C.
Larger seed of Grevellia species can be carefully nicked with a sharp knife to expose the embryo slightly prior to sowing, this can assist with the uptake of moisture and can speed germination.
Pre-treatment of smoke: Not considered critical for this species but may be beneficial.
Many members of the Proteaceae are responsive to pre-treatment of smoke. Although germination will often occur without smoke treatment it has proved to be beneficial in reducing the number of days to germination and increasing germination rates in many species.
Smoke treatments are simple and can be undertaken either by soaking the seed overnight or by applying to the surface after sowing, both provide good results. Smoke treatments available by clicking here.
General note: Seeds of many natives are dormant and require specific conditions or pre-treatment for germination.
Do not be too hasty to discard seed that does not germinate, seeds will often lay dormant until the conditions are similar to their natural requirements for germination to occur. Containers put to one side will often surprise long after they were discarded.