Acacia Dealbata, also known as Mimosa, is an evergreen tree native to Tasmania. If you’ve ever noticed a tall dramatic shrub with feathery foliage and a spray of pom-pom yellow flowers it’s likely to be a Mimosa.
Acacia Dealbata can grow to a height of ten metres but it’s easily pruned if you have a smaller garden. Its leaves are fern-like grey-green individual feathers that are evergreen and look attractive even without its dramatic flowers. In late winter or early spring fluffy yellow balls appear on the branch tips from January to April. They are highly scented and attractive to early-waking pollinators. The RHS has given Acacia Dealbata the Award of Garden Merit AGM for its attractive nature and reliability.
How Hardy Is Acacia Dealbata
Acacia Dealbata is hardy in warmer parts of the UK such as coastal areas. It will not thrive in consistently colder winds or more northern areas of the UK. In very cold winters Mimosa will hold off flowering until late spring.
Container grown Acacia Dealbata can be moved to a frost-free environment for protection in cooler climates whilst younger garden planted specimens benefit from cover during frosts.
How To Use Acacia Dealbata
Acacia Dealbata can grow to ten metres over twenty years, so it does need space. It suits the back of a flower bed against a south-facing wall, or as a specimen tree in the lawn.
You can grow a Mimosa in a container if you re-pot it as it grows in size. Alternatively you can grow an Acacia Dealbata in the conservatory.
How To Care For Acacia Dealbata
Acacia Dealbata will grow outdoors in neutral to acid well-drained soil. A sheltered location with full sun is best for bright blooms and healthiest growth.
As they grow Mimosa becomes hardier, but young specimen will require frost protection.
You can prune a mimosa lightly at the end of the flowering season, but do not leave it years before cutting back heavily as this can prevent flowering and damage the shrub.
Dig well-rotted manure around it roots in the winter and water young specimens in hot spells. Mature Mimosas rarely need watering as they are drought tolerant.
Acacia Dealbata shrubs are garden show-stoppers in bloom. If you want a shrub that will mature into an attractive evergreen tree and provide a glorious burst of bright yellow after a dull winter Mimosa is for you.
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