How Tall Does a Mimosa Tree Grow?

Also known by the Latin Acacia dealbata, Acacia Tree, Blue Wattle or Silver Wattle, Mimosa Trees are cheerful in nature and will brighten up any outdoor space. But one question frequently asked is, how much space do I need to leave for a Mimosa Tree?

Mimosa trees are usually supplied at around 1.5-2m (5-6ft) tall. However, they don’t remain at that height for long. They are vigorous growers and will reach an eventual height of up to 12m (40ft).

Be sure to keep some clear space around the tree to accommodate its spread, which is likely to reach around 3-4m (10-13ft) at full maturity. When in doubt, always consider consulting with a local tree service company before planting.

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How Long Does It Take to Grow a Mimosa Tree?

Acacia is fast growing and reaches its maximum height in around 10-20 years. They generally live for up to 30 years, occasionally living to over 50 years old.

In some countries, Acacia dealbata can become invasive and take over the garden. However, here in the UK, Mimosa is not considered to be an invasive species.

How Do You Keep a Mimosa Tree Small?

The easiest way to limit the size your Mimosa tree will eventually reach is to plant it in a pot or container. Acacias do well in pots and are an attractive way to add height and colour to patios and balconies. Use loamy soil and ensure the container can drain freely for the best results.

Bear in mind that potted trees are less hardy against low temperatures than those planted in the ground, so ensure the pot is well insulated or move it indoors over the coldest months.

Another way to control the size of an Acacia is to trim the foliage and branches. Blue Wattles don’t cope well with hard pruning, but respond well to light pruning to maintain size and shape.

Cut away any offshoots that spoil the look of the tree and any dead or damaged branches. Avoid cutting the main stem or trunk and allow it to grow freely, though you may wish to remove suckers from the bottom of the tree’s trunk.

Unlike many other outdoor plants that are best pruned in autumn or winter, the best time to prune an Acacia tree is mid to late summer. Wait until flowering has finished and prune before the new blooms start forming in autumn.

Can You Plant a Mimosa Tree Close to the House?

If you’re careful with its shallow roots an Acacia tree can get planted near buildings and walls. A young tree can get cut back to encourage multiple stems. The resulting shrub can be trained to grow up a south-facing wall in a sheltered spot where it will receive lots of natural sunlight.

As sunlight is key to a healthy fast growing Mimosa, it’s best not to plant your new tree in an area of the garden where it will be shaded by the house.

What is Special About the Acacia Tree?

You may be wondering why you should choose an Acacia tree in the first place. The answer to this lies in its beauty. Acacias are evergreen trees that provide year-round interest in the garden. The grey-green feathery foliage has a fern-like appearance.

However, they really begin to shine in late winter, when they bloom an abundance of small bright yellow flowers in clusters. These fluffy ball-shaped flowers are pleasantly fragrant and last through to early spring, bringing a splash of vibrant colour to the garden during the year’s greyest months.

The pompom flower clusters contain plenty of nectar and are a valuable early source of sustenance for bees as they begin to emerge in early spring.

Do Acacia Trees Grow in the UK?

Acacia Trees are native to Australia but can be grown outside in some parts of the UK. Mimosa trees can flourish in mild parts of Britain, including the south of the country and coastal areas, where the temperature isn’t so harsh in winter.

Acacia is hardy to around -5 to 1ºC and won’t grow consistently in cold winds. The evergreen tree may delay flowering to late spring when faced with a particularly cold season

In chillier parts of the UK, Mimosas can be grown in containers and moved into frost-free areas over winter. Alternatively, they make excellent conservatory plants.

Best Growing Conditions for Mimosa Trees

Wattle trees thrive in sheltered spots with full sun where they can soak up lots of natural light. Plant your new tree in a south- or west-facing position to maximise the amount of sun it receives and keep it out of strong winds.

Well-drained soil that is neutral or acidic is preferred. Loam and sand are the best soil types for your tree to thrive.

Are Acacia Trees Poisonous?

Mimosa trees are non-toxic to humans, animals and birds. However, they can cause blockage and other discomforts if ingested. This is particularly true in dogs, so it’s best to keep your furry friends away from your tree wherever possible.

With its interesting foliage and fragrant yellow flowers, a Mimosa Tree is the ideal way to decorate a sunny spot in the garden. Its fast-growing habit and mid-range ultimate height make it perfect for almost any outdoor space. Light soils, plenty of sunshine and protection against cold temperatures are key to ensuring your new tree will flourish and grow to its full potential.