Mornington Peninsula Coastal Garden
A layered, resilient coastal garden designed to withstand harsh salt winds and seasonal extremes. This Mornington Peninsula property features a cur...
Grevillea robusta - Silk Oak
- Regular price
- $570.00
- Sale price
- $570.00
- Regular price
-
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A GRADE STOCK, EVERY TIME.
Learn 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.
Plant Profile
Planting & Spacing Tips
Post Planting Care
Tips for Various Soil Types
1. Botanical & Physical Characteristics
BOTANICAL NAME:
Grevillea robusta
GENUS:
Grevillea
BOTANICAL SPECIES:
Grevillea
COMMON NAME:
Silk Oak
FAMILY:
Proteaceae
EVERGREEN / DECIDUOUS:
Evergreen (foliage year round)
FOLIAGE TYPE
FORM & SHAPE
2. Growth & Environmental Conditions
GROWTH RATE
EXPECTED GROWTH PER YEAR
40 – 60 cm per year (vigorous)
MATURE HEIGHT
15m - 30m Approximately
MATURE WIDTH
10 – 15 meters
SUNLIGHT EXPOSURE
FROST TOLERANCE
Frost Hardy – Survives heavy and frequent frost without damage.
AUSTRALIAN NATIVE?
Yes
3. Practical Uses & Flowering
USES:
FLOWER COLOUR
Yellow
FLOWER TYPE
FLOWERING PERIOD
Planting Tips
Plant Spacing
Ensuring A Strong Start
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: 49.5cm (W) × 35.2cm (D)
- 70L Pot: 55cm (W) × 41.8cm (D)
- 100L Bag: 50.6cm (W) × 52.8cm (D)
- 100L Pot: 66cm (W) × 49.5cm (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)
Post Planting Care
When planting a new tree or shrub, proper watering is essential to ensure healthy establishment and long-term growth. Follow these guidelines to give your plant the best start:
- Immediately After Planting:
Water generously right after planting to settle the soil around the roots and eliminate air pockets. This helps the roots make good contact with the soil. - First Three Months (Establishment Phase):
The initial three months are critical for root development. Water deeply twice daily (morning and evening) to encourage strong, deep root growth. - Irrigation Systems:
If using an irrigation system, adjust it to provide adequate water during the establishment phase. Ensure the water reaches the root zone without overwatering. - Weather Considerations:
Adjust watering based on weather conditions. Increase frequency during hot, dry periods and reduce it during cooler, wetter seasons. - Ongoing Care:
After the establishment phase (3 months), gradually reduce watering frequency but ensure the plant receives consistent moisture, especially during dry spells.
Long Term & Ongoing Care
Growing Your Grevillea robusta - Silk Oak in Various Soil Types
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