Grevillea robusta - Silk Oak
Grevillea robusta - Silk Oak
Current Stock Height Guides
Current Stock Height Guides
Height guide disclaimer: Height ranges are approximate only.
As living products, plant heights naturally vary between individual plants, batches, and seasons. No guarantee is given that supplied plants will fall within the stated range.
If minimum heights are required, you must confirm current batch heights with Evergreen Trees Direct prior to purchase.
Variation in height is normal and is not grounds for return, refund, replacement, or compensation.
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About Grevillea robusta - Silk Oak
About 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.
Distinguishing Features
Distinguishing Features
Grevillea robusta - Silk Oak is a great option for you if you:
Mature Height & Width
Mature Height & Width
Mature Height: 15m - 30m Approximately
Mature Width: 10 – 15 meters
Grevillea robusta - Silk Oak is expected to grow 40 – 60 cm per year (vigorous).
Root Ball Dimensions (Height & Width)
Root Ball Dimensions (Height & Width)
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)
Trade Customers
Trade Customers
We supply advanced trees to landscapers, developers, architects, and councils Australia-wide. Trade clients receive fast quotes, expert advice, and access to premium stock with reliable freight.
Shipping Cost
Shipping Cost
Shipping is calculated at checkout based on the pallet space your order occupies in the truck and your delivery location.
There is no charge to calculate your freight.
VOLUME DISCOUNTS
Discounts Apply Automatically at Checkout
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About Your New 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.
To Pair With Your Grevillea robusta - Silk Oak
Type: Australian Native
Buxus bodinieri Shaggy Box Topiary Balls
Type: Structural Foliage
Buxus sempervirens English Box Topiary Balls
Type: Hedging and Screening Trees
Pittosporum tenuifolium 'Silver Sheen'
Type: Hedging and Screening Trees
Rhaphiolepis indica 'Oriental Pearl'
Type: Hedging and Screening Trees
Rhaphiolepis indica 'Snow Maiden'
Uses in my Garden
Uses in my Garden
Grevillea robusta - Silk Oak works in an:
Is Grevillea robusta - Silk Oak Evergreen or Deciduous?
Is Grevillea robusta - Silk Oak Evergreen or Deciduous?
Grevillea robusta - Silk Oak is an Evergreen (foliage year round) Tree
Mature Height & Width
Mature Height & Width
Mature Height: 15m - 30m Approximately
Mature Width: 10 – 15 meters
Grevillea robusta - Silk Oak is expected to grow 40 – 60 cm per year (vigorous).
Growth Rate of Grevillea robusta - Silk Oak
Growth Rate of Grevillea robusta - Silk Oak
Grevillea robusta - Silk Oak is expected to grow 40 – 60 cm per year (vigorous).
They are considered to have a:
Frost Tolerance & Ideal Climate to plant Grevillea robusta - Silk Oak
Frost Tolerance & Ideal Climate to plant Grevillea robusta - Silk Oak
Is Grevillea robusta - Silk Oak frost tolerant?
Grevillea robusta - Silk Oak is Frost Hardy – Survives heavy and frequent frost without damage.
Does Grevillea robusta - Silk Oak Flower?
Does Grevillea robusta - Silk Oak Flower?
Grevillea robusta produces long, showy, golden-orange toothbrush-shaped flowers from late spring into early summer. These upright clusters sit above the fern-like foliage and create a striking seasonal display that stands out brilliantly against the tree’s deep green canopy.
Does Grevillea robusta - Silk Oak flower?
Flowering Period:
Flower Type:
Flower Colour:
Yellow
Is Grevillea robusta - Silk Oak an Australian Native Tree?
Is Grevillea robusta - Silk Oak an Australian Native Tree?
Yes
Grevillea robusta - Silk Oak is Native to Native to eastern Australia, where it grows in subtropical and dry rainforests of Queensland and New South Wales.
What is the Wildlife Value of Grevillea robusta - Silk Oak ?
What is the Wildlife Value of Grevillea robusta - Silk Oak ?
Its nectar-rich flowers attract honeyeaters, lorikeets, native bees and butterflies, making it a powerhouse for pollinators. The large evergreen canopy provides shelter and nesting habitat for birds, while the textured bark supports insects and microfauna that boost biodiversity in native and subtropical gardens.
How much Sunlight does Grevillea robusta - Silk Oak need?
How much Sunlight does Grevillea robusta - Silk Oak need?
Grevillea robusta - Silk Oak will thrive best in:
Preferred Soil?
Preferred Soil?
Grevillea robusta performs best in well-drained sandy or loam soils and prefers slightly acidic to neutral conditions. It may struggle in heavy clay or poorly drained areas unless improved with organic matter and coarse material to enhance drainage. Keep soil evenly moist during establishment, then transition to deep, occasional watering as the tree matures to support its drought resilience, healthy structure and reliable flowering.
Is Grevillea robusta - Silk Oak Drought Tolerant?
Is Grevillea robusta - Silk Oak Drought Tolerant?
Is Grevillea robusta - Silk Oak Drought tolerant?
As a young tree it requires regular watering, but once established the Silk Oak develops excellent drought tolerance. Naturally adapted to warm, dry and coastal conditions, it maintains vigorous growth and good canopy density with minimal supplementary watering.
Planting Information
How To Plant Your Grevillea robusta - Silk Oak
How To Plant Your Grevillea robusta - Silk Oak
Recommended Planting Spacing For Your Grevillea robusta - Silk Oak
Recommended Planting Spacing For Your Grevillea robusta - Silk Oak
Grevillea robusta - Silk Oak is expected to grow 40 – 60 cm per year (vigorous).
Long Term Care For Your Grevillea robusta - Silk Oak
Long Term Care For Your Grevillea robusta - Silk Oak
Frequently Asked Questions
Frequently Asked Questions
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