Grevillea robusta
Common name:
Silky Oak
Silk Oak
Australian Silk Oak
Pronunciation:
gre-VIL-le-a ro-BUS-tah
Family:
Proteaceae
Genus:
Type:
Broadleaf
Native to (or naturalized in) Oregon:
No
- Broadleaf evergreen tree, tall, fast growing to 115 ft (35 m), may reach 165 ft (50 m) in its habitat, symmetrical, pyramidal when young, old trees have broad tops (30-35 ft, ~9-11 m), branches have silvery pubescent. Leaves alternate, pinnately compound ("fern-like"), 15-30 cm long, the pinnae (leaflets) usually further bipinnate, lanceolate, margin involuted (rolled inward toward the upper surface), dark green above, silky pubescent below. Flowers golden orange-yellow, produced singly or in 2s or 3s, in one sided racemes, 7-12 cm long, style prominent (2 cm), flowering only occurs in trees in a subtropical and tropical environments.
- Sun, does well in heat. A valuable, fast growing, shade tree in the tropics and subtropics. Brittle in high winds. Heavy leaf drop in the spring, sporadic drop throughout the year. A popular potted plant in cooler climates (Sunset, 2007).
- Hardy to USDA Zone 8 [Young trees injured at 24° F, older trees at 1° F (Sunset, 2007)] Native to Australia (Queensland and New South Wales); considered a weed in parts of Hawaii.
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