Grevillea robusta

Grevillea robusta: characteristics and care

The Grevillea robusta, popularly known as silky oak, is a tree native to eastern Australia that is an evergreen tree with a pyramidal shape that stands out for its very decorative feathery foliage, similar to that of a fern, and for its striking orange comb-shaped flowers, which appear in spring.

Its rapid growth and elegant silhouette make it a highly valued option for both ornamental trees and for rows and windbreaks in temperate climates.

It tolerates drought well once established, although it appreciates moderate irrigation in the first few years, and adapts to poor soils as long as it has good drainage.

At Ornacom we cultivate each specimen directly, guaranteeing a balanced size and vigorous development from the first years of planting.

Extended species profile

Verified cultivation data, designed so that any visitor can understand at a glance whether the plant is suitable for their climate and garden.

Crop

Exposure

Full sun

Irrigation

ORN-WATERING 3/5 · medium — regular watering in warm seasons; allow the soil to breathe between applications

Soil / moisture

Fresh; well-drained

Bloom

Summer

Climate

USDA Hardiness

9–11

Compatible climates

Cfa, Cwa, Warm Csa, Subtropical Aw

Tolerance to humid climate

ORN-HUM 4/5 · high

Maintenance

Development

ORN-ALT 5/5 · 18–30 m · fast growth

Pests

ORN-PLAGA 3/5 · medium — sucking/boring insects and foliar or root fungi; monitor for water stress

Pass

ORN-ABONO 1/5 · very low — slow-release fertilizer, very low in phosphorus; avoid over-fertilizing

  • Warning

Sensitive to frost and Phytophthora in saturated soil; avoid fertilizers rich in phosphorus.

Grevillea robusta: characteristics and care

The Grevillea robusta, popularly known as silky oak, is a tree native to eastern Australia that is an evergreen tree with a pyramidal shape that stands out for its very decorative feathery foliage, similar to that of a fern, and for its striking orange comb-shaped flowers, which appear in spring.

Its rapid growth and elegant silhouette make it a highly valued option for both ornamental trees and for rows and windbreaks in temperate climates.

It tolerates drought well once established, although it appreciates moderate irrigation in the first few years, and adapts to poor soils as long as it has good drainage.

At Ornacom we cultivate each specimen directly, guaranteeing a balanced size and vigorous development from the first years of planting.

Extended species profile

Verified cultivation data, designed so that any visitor can understand at a glance whether the plant is suitable for their climate and garden.

Crop

Exposure

Full sun

Irrigation

ORN-WATERING 3/5 · medium — regular watering in warm seasons; allow the soil to breathe between applications

Soil / moisture

Fresh; well-drained

Bloom

Summer

Climate

USDA Hardiness

9–11

Compatible climates

Cfa, Cwa, Warm Csa, Subtropical Aw

Tolerance to humid climate

ORN-HUM 4/5 · high

Maintenance

Development

ORN-ALT 5/5 · 18–30 m · fast growth

Pests

ORN-PLAGA 3/5 · medium — sucking/boring insects and foliar or root fungi; monitor for water stress

Pass

ORN-ABONO 1/5 · very low — slow-release fertilizer, very low in phosphorus; avoid over-fertilizing

  • Warning

Sensitive to frost and Phytophthora in saturated soil; avoid fertilizers rich in phosphorus.

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