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Grevillea Robusta (Silky Oak)Grevillea Robusta (Silky Oak)

Grevillea Robusta


The Grevillea Robusta (Silky Oak) is a tall, broadleaf, evergreen tree native to Australia. With an average maximum height of 75 ft and an average maximum spread of 30 ft. It is a tree of great beauty. With a symmetrical, pyramidal crown when young that builds wider as the tree matures and an unusual trunk with a criss-cross of deep furrows.

Flowering and Foliage of Grevillea Robusta

The horizontal limbs are full of fern-like, silvery-purple leaves. Alternate and pinnately compound leaves measure around 6 to 13 inches. Leaflets (1–4 inches) are usually further bipinnate, lanceolate with an involuted margin, and rolled inward toward the upper surface. Leaves are dark olive green above and silky pubescent below.

The silky oak (Grevillea robusta) from spring to summer, heavy branches fill up with a striking display of large, rich, bright golden orange flowers that reach 5 inches. dense, one-sided spikes result in an attractive foliage display.

Silky Oak Landscape Applications

The silky oak (Grevillea robusta) is a great addition for large open spaces. Because of its rapid growth and size, it is best to consider those factors when incorporating it into your landscape design. Our recommendation is not to plant it near the house.

With beautiful fern-like foliage and vibrant orange flowers, the silky oak will definitely stand out. Making it a perfect accent tree or as a part of a Mediterranean or xeriscape garden Aside from providing shade, the tree canopy attracts bees, butterflies, and birds with its prolific blossoming.

Other Considerations: 

Furthermore, the Grevillea Robusta enjoys full sun. And grows best in US zones 9B through 11, perfect for the South Florida landscape. It prefers acidic, well-drained soil and is known to be drought-tolerant once established. There is sporadic leaf fall throughout the year that can get messy, so it is best suited for open, large areas.

🌳More popular and beautiful plants: Southern Live Oak

Additional information

Common Name

Silky Oak



Growth Rate

Fast Growth Rate

Drought Tolerance

Moderate to High Drought Tolerance

Flowering Season


Flower Color

Golden to Orange

Light Requirements

Full Sun

Zone Range


Plant Type