trefle.io · Taken Nov 15, 2016 by Hugo SANTACREU (cc-by-sa)
Proteaceae
Australian silky-oak
Grevillea robusta
Also known as Grevillea umbratica, Grevillea robusta var. compacta, Grevillea venusta, Hakea robusta
Tropical Plants · Flowering Plants · Native Plants · Trees & Shrubs · Grevillea · Australian Native · Fast Growing Tree · Evergreen · Orange Flowers · Proteaceae · Bird Attracting · Tropical Tree · Silky Oak
Australian silky-oak is a fast-growing evergreen tree prized for its fern-like foliage and brilliant orange flower clusters that attract nectar-feeding birds. It prefers full sun to light shade and well-drained soil, performing best in frost-free or mild climates. Water regularly when young to establish the root system, then reduce frequency as it matures and becomes more drought tolerant.
Growing conditions
The details behind the basics
- Daily light
- 6 hours
- Watering
- Water deeply and allow the top 2 inches of soil to dry before watering again · Every 7-10 days
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 5.3–7
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
Hardiness
USDA 4b-9b
Form & growth
Mature size and habit
- Mature height
- 12 in – 4 ft
- Spread
- 3 ft
- Spacing
- 300 in apart
- Growth rate
- Fast
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Fine
Ecology & origin
Where it belongs and what it brings
- Native to
- Argentina Northeast, Assam, Bangladesh, California, Cameroon, Canary Is., Cape Verde, Comoros, Costa Rica, Cuba, Easter Is., Ecuador, El Salvador, Eritrea, Ethiopia, Florida, Gambia, Guatemala, Gulf Of Guinea Is., Hawaii
- Attracts
- Bees, Birds, Hummingbirds
Sources: trefle
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