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Forest & Kim Starr
Proteaceae
Grevillea robusta
Silkoak Tree
Silkoak tree is native to the subtropical rainforest regions of eastern Australia. It produces airy, green, fern-like leaves with silvery undersides and masses of golden flowers that smother the tree in mid- to late spring. The tree partially defoliates as the curled flowers open up in obvious, showy clusters. Because of its beauty, the wood of this tree is harvested and used in the furniture-making industry.
In the right conditions silkoak tree is a fast grower and excels in full sun and average, well-drained soil. It is very adaptable to dry soil conditions. It can be planted as a shade tree in climates similar to its native habitat, or as a semi-hardy short hedge. Although more challenging, it may also be grown in pots, under glass in conservatory or greenhouse collections where space allows. It is weak-wooded and not a good choice for areas prone to tropical storms.
10 - 4
8 - 12
H1, H2, 8, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Tree
Full Sun
50'-100' / 15.2m - 30.5m (60)
15'-70' / 4.6m - 21.3m (35)
Spring, Late Spring
Australia
Acidic, Neutral
Well Drained
Loam, Sand
Drought
Fast
Drought Tolerant
Pyramidal
Spring, Summer, Fall, Winter
Showy
Yellow, Red, Orange, Light Yellow
Bicolor
Dark Green, Silver
Brown, Gray
Yes
No
Fine
Matte
Corky
Shade Trees, Tropical
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