Acacia dealbata (Mimosa / Silver Wattle) Plants - Outdoor GROW TROPICALS
Acacia dealbata (Mimosa / Silver Wattle) — 23cm / 5L (Collection Only)
Acacia dealbata (Mimosa / Silver Wattle) Plants - Outdoor GROW TROPICALS
Acacia dealbata (Mimosa / Silver Wattle) Plants - Outdoor GROW TROPICALS
Mimosa (Silver Wattle)

Acacia dealbata (Mimosa / Silver Wattle)

£31.99
Protect from hard frostSun-lovingEvergreenRHS award winnerLoved by pollinators
Pot size

FREE tracked delivery on orders over £60

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Description

The Acacia dealbata, known as the mimosa or silver wattle, is one of the most spectacular exotic trees you can grow in a mild British garden. Fast-growing and evergreen, it carries feathery, finely divided silver-green foliage all year round, then erupts in late winter into a haze of fragrant, fluffy yellow pompom flowers just when the garden needs it most. This is a plant that turns a warm, sheltered wall or courtyard into something close to the Riviera.

Native to south-eastern Australia and Tasmania and a member of the pea family (Fabaceae), Acacia dealbata is rated RHS H3, so it is happiest in coastal and relatively mild parts of the UK. For a mimosa, a cold and wet winter is far more of a threat than cold by itself. Waterlogged soil paired with low temperatures is far more likely to see it off than a short, dry frost. Give it a warm, sheltered spot with sharp drainage, and protect the plant during hard frosts, and it will reward you handsomely. See our hardy exotics seasonal guide for what to expect through the year.

As a fast, airy evergreen it makes a superb piece of living architectural foliage and a natural centrepiece for exotic borders. The nectar-rich winter flowers are a magnet for early bees, making it a valuable choice for plants for pollinators, while in mild coastal gardens it thrives alongside other coastal and exposed planting. Pair it with a hardier structural partner such as Trachycarpus fortunei for year-round backbone, and browse the full hardy exotics range to build a complete scheme.

Every mimosa we supply is nursery-grown, selected for a healthy framework and strong roots, and packed with care to arrive in superb condition.

Live Arrival Guarantee

All plants are covered by our 7-day live arrival guarantee. We pack every order in protective, sustainable packaging designed to keep your plants safe in transit, and every plant is checked before it ships. On the rare occasion something is not right on arrival, we will make it good, provided the plant is still in its original nursery pot.

Find out more

What to Expect

Seasonal by nature: what to expect

  • Grown outdoors, the way nature intended. Weather-tested and hardened in real UK conditions, so they thrive in your garden. A few marks on the older leaves are normal, the sign of a tough, real plant rather than a flaw.
  • It follows the seasons. Depending on when you order, your plant may arrive cut back, dormant or leafless. That's healthy: dormancy is the ideal time to plant.
  • Posted, not posed. Big leafy plants like bananas and gingers may be trimmed or gently folded to travel safely. It does the plant no harm, and it powers away again in spring.

Not sure what to expect from yours? Dormant, cut-back or weather-marked plants are all perfectly healthy and normal. Read what to expect through the seasons

Delivery & returns

Order by 1pm Monday to Friday for same day dispatch. Every plant travels in protective, plant-safe packaging with tracked delivery.

Changed your mind? See our Return Policy.

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How to care for Mimosa (Silver Wattle)

Plant me in full sun and protect me when hard frost threatens.

In their words

What our customers say

Arrived just like the photos - maybe even fuller. Healthy, well-acclimated, and straight into my collection with no issues.

Emily P.

Flawless leaves, stunning variegation, and clearly cared for by experts. It’s already a talking point in my home office.

James R.

Hard to find rare plants that are pet-safe. Ours arrived in perfect condition and looks amazing without any worry.

Sophie L.
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About Mimosa (Silver Wattle)

Acacia dealbata (Mimosa / Silver Wattle) needs full sun and well-drained soil. It is half-hardy to around −5°C and needs protection from hard frost.

Good for

Architectural Coastal & Exposed Exotic Borders Wildlife & Pollinators

Hardiness

TenderVery hardy

RHS H3 · Semi-hardy · down to around −5°C

RHS H3, hardy to about -5C. Protect young plants in hard frosts and shelter from cold, drying winds.

Position

Full sunSouth-facingWest-facingSheltered

full sun in a warm, sheltered spot, ideally against a south or west facing wall that stores heat and shrugs off cold winds.

Soil

LoamSandWell-drainedAcid pHNeutral pH

neutral to acid, free-draining loam or sand. It dislikes very alkaline or chalky ground, and sharp drainage is essential to avoid cold, wet roots in winter.

Watering

Water regularly through the first two summers to establish strong roots, keeping the soil moist but never waterlogged. Once established it is notably drought-tolerant. Feed in spring and prune lightly straight after flowering to keep a tidy, well-furnished shape. Read moreShow less

Water regularly through the first two summers to establish strong roots, keeping the soil moist but never waterlogged. Once established it is notably drought-tolerant. Feed in spring and prune lightly straight after flowering to keep a tidy, well-furnished shape.

Mature size

Height8-12 m
Spread2.5-4 m

Reaches full size in 10-20 years

Growth habit

Columnar/upright

Flowering

Jan-Mar · Yellow

Seasonal colour

Foliage

Evergreen

Pruning

Flowers in late winter and early spring. Prune straight after flowering to shape and reduce size, keeping cuts to younger wood rather than old bare stems.

Toxicity

No significant reported toxicity to people or pets, and it is not listed as a major hazard. The bark and leaves are high in tannins, so nibbling can cause mild stomach upset, and the abundant pollen may act as an allergen for sensitive individuals.

Native range

SE Australia, Tasmania

Family

Fabaceae

Also known as

Acacia dealbata (Mimosa / Silver Wattle)

Genus

Acacia
Good to know

Frequently Asked Questions

Is Acacia dealbata hardy in the UK?

Acacia dealbata is rated RHS H3, hardy to around -5C, so it is reliable outdoors in coastal and milder parts of the UK. The main risk is not cold alone but cold combined with wet, so it needs sharp drainage and a warm, sheltered spot, with frost protection for young plants. See our hardy exotics seasonal guide for more.

How big does a mimosa tree (Acacia dealbata) grow?

It is fast-growing and can reach around 8 to 12 m tall with a spread of 2.5 to 4 m over 10 to 20 years. You can keep it smaller and bushier by pruning straight after flowering, which also makes it easier to train against a wall as living architectural foliage.

When does Acacia dealbata flower?

Mimosa flowers in late winter to early spring, usually from January to March, carrying masses of fragrant, fluffy yellow pompom blooms. Because it flowers so early, it is a valuable nectar source and one of our favourite plants for pollinators.

Where is the best place to plant Acacia dealbata?

Choose a warm, sheltered spot in full sun, ideally against a south or west facing wall, in free-draining neutral to acid soil. Avoid very alkaline or chalky ground and cold, wet positions, as waterlogging in winter is the biggest risk. It also does well in milder coastal and exposed gardens.

Is Acacia dealbata evergreen?

Yes. Acacia dealbata is evergreen, holding its feathery, silver-green foliage all year, which is part of what makes it such a striking structural plant among our hardy exotics.

Is Acacia dealbata toxic to pets?

Acacia dealbata is not listed as a major toxic plant and is generally considered non-toxic to people, cats and dogs. The bark and leaves are high in tannins, so nibbling can cause mild stomach upset, and the abundant pollen may bother allergy-prone people, so it is sensible to discourage pets from chewing it.

Does my plant come with a pot?
Your plant will arrive in its nursery grow pot — the plastic pot it's been growing in. We don't include a decorative pot as standard, and there's a good reason for that: it means you get to choose one that fits your space and style, rather than being stuck with something that doesn't suit your home.

It also means you're not paying extra for a pot you might not want. The nursery pot is perfectly fine to keep your plant in for a while, just pop it inside a decorative cover pot or cache pot and you're good to go. When you're ready to repot (usually after a growing season or when roots start poking out the bottom), you can move it into something more permanent with fresh soil.

If you're not sure what size cover pot to go for, check the pot selector tool listed above, you'll want a decorative pot that's a centimetre or two wider than that to give it a comfortable fit.
How big will my plant be when it arrives?
Every plant on our site includes the pot size (e.g. 12cm) and, where possible, an approximate height. That's the most reliable way to set your expectations, photos can sometimes make a plant look larger or smaller than it really is.

If you're thinking "that sounds quite small for the price," here's something worth knowing: younger, smaller plants almost always adapt better to your home than larger ones. They adjust faster to your light and humidity, put out new growth more quickly, and tend to establish stronger root systems long-term. A plant that grows into your space will usually outperform one that was already big when it arrived.

That said, every plant is an individual. The one you receive may vary slightly in height, shape, or fullness compared to the photo, that's the nature of living things, not a quality issue. We select healthy, well-established specimens, and if you ever feel your plant doesn't match what you were expecting, just get in touch and we'll take a look.
What makes your plants different from the supermarket or garden centre?
There's a big difference between a plant that's been sitting under on a retail shelf and one that's been looked after and cared for by people who specialise in exactly this.

Our plants are grown in house or sourced from specialist nurseries, many of them varieties you simply won't find at your local garden centre or supermarket. Before anything leaves us, it's checked over by our horticultural team to make sure it's healthy, well-rooted, and ready to thrive in your home. We're not shifting volume off a pallet, we're choosing plants we'd want to keep ourselves.

When you buy from a supermarket, you get a plant and a generic care label. When you buy from us, you get the knowledge that comes with it, detailed care guidance, a team you can actually contact if something isn't going right, and the confidence that what's arriving has been looked after properly from the moment it was grown to the moment it reaches your door.

We're a specialist nursery first, not a retailer that happens to sell plants. That's the difference, and you'll see it the moment you open the box.
What should I do when my plant arrives?
First things first, unbox it as soon as you can. Plants don't love being in dark boxes any more than you would, and the sooner yours is out and breathing, the better.

Remove all the packaging carefully, give the soil a check with your finger, and water lightly if it feels dry. Then find it a spot with appropriate light, but avoid putting it straight into harsh direct sun or next to a radiator. Think of it like arriving somewhere new after a long journey: it needs a moment to adjust.

It's completely normal for your plant to look a little tired or droopy after transit. This is called transit stress, and most plants bounce back within a week or two. You might see a yellow leaf or some drooping, don't panic, and resist the urge to overwater or start repotting straight away.

Our advice for the first couple of weeks: leave it in its nursery pot, water it only when the top layer of soil feels dry, and let it acclimatise to your home's light, temperature, and humidity. Once it's settled in and showing signs of new growth, you can think about repotting or moving it to its permanent spot.

Every plant we sell comes with a care guide on the product page so you'll know exactly what it needs going forward. And if anything doesn't look right, get in touch with our team, we're always happy to help.
Will my plant survive being shipped?
Yes! and we go to serious lengths to make sure of it. Every plant is hand-packed by our team with protective wrapping and secure, custom-designed boxes to keep it stable and safe in transit. We've shipped hundreds of thousands of plants across the UK and our packaging methods have been refined over years to handle the bumps and jolts of delivery.

During colder months, we monitor weather forecasts and offer heat packs where needed to protect against frost. In extreme conditions, we may hold your order for a day or two rather than risk sending it out, we'd rather you wait an extra day than receive a stressed plant.

That said, plants are living things, and the occasional transit wobble can happen. If your plant arrives damaged or isn't in the condition you'd expect, just get in touch within 48 hours with a photo, and we'll make it right, whether that's a replacement or a full refund. No fuss.

The short version: we treat every box like it's going to someone who really cares about what's inside, because it is.
Why Grow Tropicals

Plants delivered the way they deserve

Packaged with Care

Packaged with Care

Every order is hand-packed in eco-friendly, protective packaging - refined through thousands of deliveries to ensure your plant arrives healthy, hydrated, and looking its best.

Backed by our Live Arrival Guarantee.

Perfect for Gifting

Perfect for Gifting

From rare collector’s pieces to easy-care favourites, our plants arrive fully potted and ready to enjoy. Add a personalised note at checkout for a thoughtful finishing touch.

Delivered fresh, beautiful, and gift-ready.

Sustainability at Heart

Sustainability at Heart

All plants are ethically sourced from trusted growers, never wild-collected. Every order ships carbon-neutral in minimal-waste packaging.

Good for your home - and the planet.

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Acacia dealbata (Mimosa / Silver Wattle)
£31.99