Grevillea Trees: A Comprehensive Guide

by Australian Flowers

If you are thinking of adding Grevilleas to your garden, this guide will give you all the information you need on Grevillea trees and flowers.

You have a lot of choices when it comes to Grevillea trees. Grevilleas come in many shapes and sizes, from small shrubs to large trees. There are even ground-cover Grevilleas!

Grevillea Facts

The Grevillea genus contains over 300 species of flowering plants native to Australia. The Grevillea tree was named after Charles Francis Greville, an English horticulturist. Grevilleas are often called spider flowers or toothbrush flowers.

Grevilleas are members of the Proteaceae family, including banksias and proteas. Its flowers are pollinated by birds, specifically honeyeaters. Grevillea trees can range in size from small shrubs to large trees.

Grevillea trees

Grevillea trees can be a great addition to your garden. They are easy to grow and care for and can provide beautiful flowers and foliage. Here is a complete guide to growing Grevillea trees.

It gives an ambience of feeling close to nature. They are a thorny little tree with a reputation for being one of the easiest Grevilleas to grow. Some love to grow Grevillea as a Bonsai tree.

Grevillea robusta ‘Silky Oak.’ Grevillea Trees: Grevillea Robusta 'Silky Oak.'

Grevillea robusta ‘Silky Oak’ is a fast-growing, evergreen tree that can reach up to 30 metres. It has broad, dark green leaves and bears clusters of small, cream-coloured flowers in late spring and summer. Grevillea robusta ‘Silky Oak’ is an excellent choice for screening or as a general garden specimen.

This is a great flower to start with if you want to attract birds to your garden as it is a food source for them. Grevilleas are generally tough and adaptable plants that can tolerate most soil types and climates. They are also relatively low maintenance, making them ideal for busy gardeners.

Grevillea ‘Ivory Whip’

Grevillea’ Ivory Whip’ is a spectacular, fast-growing Grevillea that will make a statement in any garden. A native of Australia, Grevilleas are known for their unusual flowers and rugged nature. ‘Ivory Whip’ is no exception, with its long, ivory-coloured flowers blooming from spring to summer. Grevilleas are drought-tolerant and low-maintenance, making them the perfect plant for busy gardeners.

Ivory Whip is easy to care for and can be grown in various soils, as long as they are well-drained. Grevilleas prefer full sun but will tolerate some shade. If you live in an area with heavy rainfall, Grevilleas are the perfect plant for you – they are highly drought-tolerant and thrive in dry conditions.

Grevillea ‘Moonlight’

Grevillea’ Moonlight’ is a stunning Grevillea variety that is covered in cream and yellow flowers throughout spring and summer. Growing to around 4m tall, Grevillea’ Moonlight’ is an excellent tree for small gardens as it doesn’t require much pruning or maintenance.

Suppose you’re looking for a Grevillea that will flower profusely and add some beautiful colour to your garden. In that case, this plant also symbolizes good luck, so if you’re looking for a Grevillea that will bring some extra good fortune, Grevillea’ Moonlight’ is the one for you!

Grevillea ‘Robyn Gordon’

Grevillea’ Robyn Gordon’ is one of the most popular Grevillea varieties, and it’s easy to see why! This Grevillea produces an abundance of red, spider-like flowers that are simply beautiful. Growing to around 3m tall, Grevillea’ Robyn Gordon’ is perfect for small gardens and makes a great feature plant.

This gives hope to anyone who loves Grevilleas but doesn’t have a lot of space, as this variety can be pruned to shape and will still flower profusely. Grevillea’ Robyn Gordon’ is also drought tolerant once established, so it’s perfect for gardens in dryer climates.

Grevillea ‘Superb Grevillea’

Grevillea’ Superb Grevillea’ is a stunning evergreen Grevillea that produces an abundance of red flowers throughout spring and summer. Growing to around 4m tall, Grevillea’ Superb Grevillea’ is an excellent plant for privacy screening or as a feature plant in the garden.

Its appearance is similar to Grevillea’ Robyn Gordon’; however, the flowers are slightly bigger and a more vibrant red. Grevillea’ Superb Grevillea’ is also drought tolerant once established, making it an excellent plant for gardens in dry climates.

Grevillea Growing Conditions

 Grevilleas need well-drained soil and full sun. They are drought tolerant once established but will flower and leaf more profusely with regular watering. Grevilleas do not like wet feet, so ensure the planting hole is well drained. A sandy loam or loam soil with some organic matter is ideal. If your soil is heavy clay, consider planting Grevilleas on a mound.


The Grevillea prefers well-drained soils with a neutral to slightly acidic pH. You can lower the pH if your soil is too alkaline by adding sulphur or pine needles. Grevilleas are not particularly drought tolerant, so keep an eye on the moisture levels in your soil, especially during the hot summer months.

LightGrevillea Flower

Grevilleas need at least six hours of direct sunlight each day to flower well. If you live in an area with hot summers, choose a spot that gets morning sun and afternoon shade. In cooler climates, a sunny spot is fine.


Climate is the most critical factor influencing Grevillea’s growth. They occur naturally in all climates, from tropical to cool temperate but do best in areas with a well-defined winter and summer. Grevilleas will not tolerate extended periods of waterlogging or flooding but have some tolerance to drought once established.

How To Grow Grevillea

Grevillea trees are a native Australian plant perfect for those who want to add some extra greenery to their garden. They are hardy trees that can tolerate most conditions and will continue to grow and thrive with proper care.

Grevillea trees can grow quite large, so it is essential to plant them in an area with plenty of room to grow. When planting Grevillea trees, it is best to produce them in the spring or summer, so they have ample time to establish themselves before the colder weather sets in.

When to plant Grevillea

Grevilleas can be planted at any time of year, but they will establish more quickly if planted in spring or autumn when the weather is mild. Suppose planting in summer, clean water regularly until the roots have become found.

Grevillea Plant Care

Pruning Grevillea Tree

To care for your Grevillea tree, start planting it in an area that receives full sun. Grevilleas prefer well-drained soil, so be sure to amend your soil with sand or compost before planting.

Once your tree is planted, water it regularly (about once a week) until it becomes established. Grevilleas are drought tolerant once established but will need extra water during periods of extended drought.

Grevilleas are generally pests and diseases free but can be susceptible to scale mealybugs and aphids. If you see problems on your Grevillea tree, treat them with insecticidal soap or neem oil.


Grevilleas are drought tolerant once established, but they will flower and foliage better if given a good drink during extended dry periods. Established plants can be left for long periods without water but will benefit from occasional deep watering during prolonged droughts. Be careful not to overwater as this can lead to root rot.


Grevilleas love an excellent mulch around their roots to help keep the soil cool and moist. A mulch layer also helps suppress weeds that compete with Grevilleas for water and nutrients. An ideal mulch is a 5-7cm (2-3in) layer of well-rotted compost or manure. Grevilleas also benefit from a top-dressing of compost in early spring.


Grevilleas are tough, adaptable plants that require little care once established. However, occasional pruning will help to maintain their shape and encourage new growth. Grevilleas can be pruned any time of year, but the best time is after flowering. To prune Grevilleas:

  • Start by removing any dead, diseased or damaged branches.
  • Next, cut back any branches crossing or rubbing against each other.
  • Finally, thin out the Grevillea plant by removing some of the older inner branches. This will help to increase air circulation and allow more light to reach the centre of the plant.


Grevilleas are not heavy feeders, so you don’t need to fertilize them too often. A portion of slow-release native plant food in late winter or early spring is all they need. If you want to give them a little extra boost, you can top dress with compost or blood and bone in early spring. Grevilleas also like a little excess water during prolonged dry periods.

Interesting facts 

  • Grevillea trees are a genus of evergreen flowering plants native to Australia, New Caledonia and Indonesia. The genus comprises more than 360 species, including both shrubs and trees.
  • Grevillea trees are typically fast-growing and have showy flowers that bloom throughout the year.
  • Grevilleas are popular as ornamental plants, and many cultivars have been developed for garden use. They are also used in landscaping and as street trees. Grevillea trees are relatively easy to care for and tolerate poor soil conditions. However, they do need full sun to flower well. With proper care, Grevillea trees can live for many years.

Frequently Asked Questions about Grevillea Trees

Where do Grevilleas grow best?

Grevilleas tend to grow best in areas that have a lot of sunlight and well-drained soil. They can be grown in either pots or in the ground, but it’s important to make sure the pot has a drainage hole at the bottom so that water can escape.
If you’re growing your grevillea in the ground, it’s important to dig a hole that’s twice as wide as the pot and just as deep. Place the pot in the hole and fill it with soil, making sure to pack it down firmly. Water your plant well after planting, and then make sure to give it a good watering at least once a week.

Are Grevillea roots invasive?

No, Grevillea roots are not invasive.
The root systems of Grevillea are relatively shallow and fibrous, with a well-developed mat of fine roots near the surface. This root system is not invasive and does not damage or compete with other plants.

How long do Grevilleas last?

Most Grevilleas will last for many years if they are planted in the right spot and well-maintained.
Grevilleas come in various shapes and sizes, with bloom colours ranging from creamy white to deep red. Some taller varieties can reach heights of up to 20 feet, while others remain relatively small (under 3 feet tall).

What is the hardiest Grevillea?

The hardiest Grevillea is probably Grevillea robusta, also known as the Silver Oak. It’s a thorny, drought-tolerant shrub that can grow in extreme temperatures and high-humidity climates. It’s also resistant to pests and diseases, making it a good choice for hedges or landscaping in areas with poor soil.

How do you make Grevillea bushy?

There are a few things you can do to make your Grevillea bushier. One is to prune it regularly, removing any dead or broken branches. You can also pinch off the tips of new growth to induce bushy growth. Finally, you can fertilize your bush with a high-nitrogen fertilizer every few months.

How long does Grevillea take to mature?

It takes about ten years for Grevillea to fully mature.
Grevilleas are grown from cuttings, so the best time to take a cutting is in late winter or early spring before new growth begins. The new cutting should be 3-4 inches long and include at least two pairs of leaves. Strip off the lower leaves and plunge the cutting into a jar of water until you’re ready to plant it.
Grevilleas like full sun or part shade and well-drained soil. They can be used as hedges, screening plants, or planted in groups for added colour.

Why is my Grevillea going yellow?

Your Grevillea may be going yellow because of a lack of water. Make sure to water your plant regularly and give it plenty of sunlight.
If the leaves are also curling, it could signify that pests or diseases are attacking your plant. In this case, you’ll need to take steps to treat the problem. Consult with a local gardening expert for advice on addressing the specific issue you’re experiencing.

Can I use Seasol on grevilleas?

Yes. Seasol is a water-soluble, balanced fertilizer containing trace elements that can be used on any plant, including grevilleas.
Seasol is a balanced fertilizer with trace elements, making it perfect for any plant – including grevilleas. It’s a water-soluble fertilizer that the plant’s roots can easily absorb. This makes it an excellent choice for fertilizing grevilleas, as they tend to be quite thirsty plants.

How do you encourage Grevillea’s growth?

When it comes to gardening, there are a few extra things you can do to encourage your Grevillea plants to grow. For starters, make sure that the soil is moist but not wet. You can water your plants regularly or water them once every two weeks and give them a good soak.
In addition, you can help your plants grow by adding some organic matter to the soil. You can add compost or peat moss to the ground before planting your Grevilleas. And finally, don’t forget to fertilize! Fertilize with a balanced fertilizer such as 10-10-10 every three months.

Are grevilleas deep-rooted?

Yes, grevilleas are deep-rooted. They have a deep taproot that can grow up to 15 feet long. This allows them to absorb water and nutrients from the soil over a wide area.
Grevilleas are drought-tolerant plants and can survive in areas with little rainfall. They are also salt tolerant and can be grown near the coast. Their deep root system helps them to withstand these harsh conditions.

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