Grevillea Robusta Trees

Grevillea robusta Trees for Sale

Grevillea robusta, commonly known as Silky Oak, Southern Silky Oak, or Silk Oak, is a tall and fast-growing flowering tree native to eastern Australia. It is widely cultivated in tropical and subtropical regions as an ornamental shade tree, avenue tree, and agroforestry species. The tree is particularly admired for its fern-like foliage and striking yellow to orange flowers.

Grevillea robusta is an excellent choice for large gardens, parks, avenues, open landscapes, commercial properties, and other locations where a large, upright tree is desired.

Grevillea robusta Plant Characteristics

Grevillea robusta develops into a tall, upright tree with spreading lower branches. It can reach up to approximately 30 meters in favorable conditions, although trees in cultivation are often considerably smaller.

The leaves are deeply divided and fern-like, creating a fine-textured canopy. Mature leaves are dark green on the upper surface and have a distinctive silky or silvery appearance underneath, which gives the tree its common name, Silky Oak.

The species is fast-growing and has been widely planted as a shade tree and street tree throughout tropical and subtropical regions.

Silky Oak Flowers

One of the most attractive features of Grevillea robusta is its bright yellow to orange-yellow flowers. The flowers are produced in dense, brush-like or comb-shaped clusters, generally arranged along the ends of branches.

The flowering display can be particularly impressive when the tree is mature. Its flowers are rich in nectar and attract birds, insects, and other nectar-feeding wildlife.

The combination of bright flowers and finely divided foliage gives Grevillea robusta considerable ornamental value.

Grevillea robusta Foliage

The foliage of Grevillea robusta is one of its most recognizable characteristics. The long leaves are deeply divided into numerous narrow segments, giving them a soft, fern-like appearance.

The upper surface is generally dark green, while the underside has a silvery or silky texture. This contrast becomes especially noticeable when the leaves move in the wind.

Growing Grevillea robusta

Grevillea robusta performs best in full sun and well-drained soil. It is adapted to warm conditions and is relatively drought tolerant once established.

For healthy growth:

• Plant in full sun.
• Choose well-drained soil.
• Provide regular watering while young.
• Avoid prolonged waterlogging.
• Allow sufficient room for the mature tree.
• Prune moderately when necessary to maintain a suitable structure.
• Protect young trees from severe frost.
• Avoid planting large specimens too close to buildings or paved areas.

The species can tolerate a range of soil types when drainage is adequate, but poorly drained conditions can increase the risk of root problems.

Grevillea robusta as a Shade Tree

Silky Oak is widely planted as a shade-providing tree because of its rapid growth and tall, spreading form. It has also been used extensively for shade in agricultural systems, including tea and coffee plantations.

Its tall growth makes it particularly suitable for large properties and open landscapes. Because mature trees can become very large and develop substantial surface roots, careful site selection is important.

Uses of Silky Oak Trees

Grevillea robusta is a versatile tree with applications in both ornamental and functional landscapes. It can be planted for:

• Large gardens
• Parks
• Avenues
• Roadsides
• Open lawns
• Commercial landscapes
• Institutional grounds
• Shade planting
• Agroforestry
• Windbreaks
• Specimen planting
• Large-scale landscaping projects

Its attractive flowers and unusual foliage also make it an excellent specimen tree where there is enough room for its mature size.

Grevillea robusta for Landscaping

For large landscapes, Grevillea robusta offers a combination of fast growth, attractive foliage, seasonal flowers, and useful shade. Its tall form can provide vertical structure in parks, gardens, avenues, and open properties.

However, because the mature tree can reach a substantial size, it should be given adequate space. It is generally better suited to larger landscapes than small residential gardens.

Silky Oak Tree Care

Once established, Grevillea robusta can tolerate periods of dry conditions and generally requires relatively low maintenance. Young plants need more regular irrigation while their root systems develop.

Formative pruning can be used to develop a strong structure, particularly when trees are being grown for landscape planting. Good drainage is important because consistently wet soil can cause root problems.

Buy Grevillea robusta Trees from Khizra Nursery

Khizra Nursery supplies Grevillea robusta trees for sale, commonly known as Silky Oak or Southern Silky Oak.

These trees are suitable for gardens, parks, avenues, shade planting, commercial landscapes, institutional grounds, agroforestry, specimen planting, and large landscaping projects.

Contact Khizra Nursery for available sizes, quantities, pricing, and worldwide shipping arrangements. Bulk quantities can be supplied for larger planting and landscaping projects.

Frequently Asked Questions

What is the botanical name of Silky Oak?

The botanical name is Grevillea robusta A.Cunn. ex R.Br. It belongs to the family Proteaceae and is an accepted species according to Kew’s Plants of the World Online.

What are the common names of Grevillea robusta?

Grevillea robusta is commonly known as Silky Oak, Southern Silky Oak, and Silk Oak.

What color are Grevillea robusta flowers?

The flowers are generally bright yellow to orange-yellow, although reddish tones can also occur. They are arranged in attractive, brush-like clusters.

How tall does Grevillea robusta grow?

Grevillea robusta can reach approximately 30 meters in favorable conditions, although cultivated trees are often smaller.

Is Grevillea robusta evergreen?

Grevillea robusta is generally regarded as an evergreen tree, although it may lose a significant portion of its foliage before flowering under some conditions.

Does Grevillea robusta need full sun?

Yes. Full sun is recommended for strong growth and good flowering.

Is Grevillea robusta drought tolerant?

Yes. Established Silky Oak trees are relatively drought tolerant and can perform well in warm climates with seasonal dry periods.

Is Grevillea robusta suitable for small gardens?

Generally, no. Because the species can become a large tree with a substantial root system, it is better suited to large gardens, parks, avenues, and open landscapes.

Can Grevillea robusta be used as a roadside tree?

Yes. Grevillea robusta is widely planted as a street and shade tree, although sufficient space should be provided for its mature size and root development.

Where can I buy Grevillea robusta trees?

You can buy Grevillea robusta trees from Khizra Nursery for gardens, parks, avenues, shade planting, landscaping projects, specimen planting, and bulk requirements, with worldwide supply and shipping options.