Grevillea robusta - Silk Oak
Grevillea robusta, commonly known as Silk Oak or Australian Silver Oak, is a majestic evergreen native tree celebrated for its elegant form, fern-like pinnate foliage with silvery undersides, and vibrant orange-red flower clusters that bloom from late spring to early summer. Growing up to 30 meters tall and spreading 10–15 meters wide, this fast-growing tree creates bold scale and year-round structure in large gardens, parks, and open landscapes.
Thriving in full sun to partial shade and adaptable to various soils including clay and sand, Grevillea robusta is moderately drought-tolerant once established. Its upright, symmetrical shape with a conical crown makes it an excellent shade tree, ornamental feature, and habitat provider for native birds and pollinators. With low to moderate maintenance needs, Silk Oak is a reliable and striking choice for spacious outdoor settings that demand both beauty and ecological value.
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Product specification
Showcase specifications about a product to help your customers making an informed decision about their purchase.
40 – 60 cm per year (vigorous)
Evergreen (foliage year round)
Frost Hardy – Survives heavy and frequent frost without damage.
Grevillea robusta - Silk Oak is considered:
Yes
Flower Colour: Yellow
Flower Type:
Flowering Period
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Planting Guide
Plant Spacing
How to Plant Grevillea robusta - Silk Oak
Root Ball Dimensions (Width × Depth) For Planting
Use this as a reference when digging your planting hole. We recommend digging at least 10% wider than the dimensions below to encourage strong root development.
- 30cm Pot: 33cm (W) × 30cm (D)
- 40cm/45L Pot: 44cm (W) × 41.5cm (D)
- 50cm Pot / 70L Pot: 55cm (W) × 41.8cm (D)
- 100L Bag: 50.6cm (W) × 52.8cm (D)
- 150L Bag: 66cm (W) × 55cm (D)
- 200L Bag: 71.5cm (W) × 60.5cm (D)
- 300L Bag: 88cm (W) × 63.8cm (D)
- 400L Bag: 99cm (W) × 66cm (D)
- 500L Bag: 122cm (W) × 66cm (D)
- 750L Bag: 134cm (W) × 69cm (D)
- 1000L Bag: 146.3cm (W) × 71.5cm (D)
- 2000L Bag: 176cm (W) × 82.5cm (D)
Subheading
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