Grevillea robusta, also known as the Silky Oak, is a majestic tree native to Australia, prized for its finely cut foliage and striking yellow-orange flower spikes in spring. Its fast growth and tolerance for poor soils make it an excellent choice for adding an exotic touch to gardens in mild climates.
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Characteristics of Grevillea robusta
Grevillea robusta, commonly known as the Silky Oak, is an evergreen tree with a pyramidal shape that can reach a height of 10 meters and a width of 4 to 6 meters. Its finely divided foliage showcases a contrasting dark green upper side and silvery underside, creating an attractive visual effect. Flowering occurs from May to June, producing spikes of yellow-orange flowers, a signature feature of the Proteaceae family. Although it tolerates temperatures as low as -6.5 °C, this tree should be protected in colder climates.
How to use Grevillea robusta ?
Grevillea robusta is perfect as a focal point, adding an exotic and elegant touch to gardens in mild climates. Its rapid growth and majestic appearance make it an excellent choice as a light-shade tree, allowing other plants to thrive beneath it. It can also be grown in large containers on terraces or verandas, bringing a touch of the tropics to outdoor spaces. Due to its potential size, it is best suited for open ground in large gardens where it can develop fully.
Tips for successfully growing Grevillea robusta
To grow Grevillea robusta successfully, plant it in well-drained, neutral to acidic soil, preferably sandy or slightly rocky. Full sun exposure is essential to encourage its growth and flowering. Plant in spring or autumn, and water regularly during the first few years to ensure good root establishment. Once established, this tree is drought-tolerant and requires minimal maintenance. However, protect it from frost by covering it or moving it indoors if temperatures fall below -5 °C.
