Botanical Name: Grevillea robusta
Common Name: Silk Oak
Type of Plant: dicot: tree
Character evergreen
 
Habit of Growth:
Overall Shape an erect, tall, loosely columnar to pyramidal tree; older trees become broad and very picturesque, develop a rough, fissured, gray-brown bark
Height 30-60' (100')
Spread 1/3 to 1/2
Growth Rate rapid
 
Environment:
Exposure outdoors full sun; thrives in desert heat
Soil prefers deep, well-drained soils; tolerates poorer
Hardiness young trees: some frost; mature trees: hardy zones 8-9, 12-24
 
Morphology:
Leaves 2-pinnatifid; alternate, lobes lanceolate and entire or secondarily lobed; blades are silky beneath; leaves 6-12" long
Flowers orange, in flattened racemes, 2-4" long, along the branch (older wood); petals are lacking; numerous stamens; May-July (April)
Fruit a follicle:1/2-3/4" long, dark brown withwinged seeds
 
Propagation:
seed
 
Usage:
a fast-growing vertical accent; suitable for groves, large-scale landscapes, erosion control; messy; brittle branches; leaf drop, not suitable for small landscapes – best for informal or drought-tolerant plantings
 
Landscape Care:
Watering an occasional deep soak; grows poorly in heavy irrigated areas; becomes very drought-tolerant after established
Fertilizing little required except if overwatered; check for chlorosis
Pruning stake and develop primary framework when young; thin out
Pests/Diseases root rot is a problem in warm wet soils
Special Conditions/Other
 
Origin: Australia
Family: Proteaceae

Notes:
 
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