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Grevillea robusta /Silk Oak

Grevillea robusta  / Grevillea robusta
Typical tree form growing as a single specimen
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Typical tree form growing as a single specimen

Close-up of classic flowers and foliage


Evergreen except when grown where freezes occur

The deeply cut, fern-like leaves are flat in shape

Specimen, lawn tree growing in the Vatican Garden in Rome, Italy

Typical form of tree. Lawn tree at the Vatican Garden in Rome, Italy

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Scientific Name: Grevillea robusta
Common Name: Silk Oak
Plant Type: Evergreen
Leaf Type: Broadleaf
Hardiness Zone: 9, 10, 11 Determine Your Zone
Height: over 50 feet
Spread: 30 - 40 feet
Bloom time: Spring
Flower color: Orange
Light Exposure: Sun, Part Sun
Drainage: Well drained, Moist, Dry
Rate of Growth: Fast
Water Requirement: Medium
Maintenance Level: Low
Susceptible to insects
and diseases:
Landscape Categories: Plants for Xeriscapes
Plants That Attract Hummingbirds
Comments: This native of Ausstralia is not an oak, but a member of the Protea family. Hardy only in Southern Florida and California. It can survive in hot, dry landscapes and gives quick shade. It has distinctive foliage and unusual floral parts. It is a messy tree by dropping leaves, flowers, seeds and branches. It attract huimmingbirds and butterflies. It has drought tolerance. Subject to root rots, particularly when planted in poorly drained, wet soils.