Cootamundra wattle

Sun

Full sun; shelter from cold, drying winds.

Water

Water regularly while establishing; once rooted, it tolerates drought and needs occasional deep watering during prolonged dry weather.

Soil

Well-drained sandy, gravelly or loamy soil, preferably slightly acidic to neutral. Avoid waterlogged ground and very chalky soil.

Height

15-25 ft (4.5-7.5 m)

Spread

12-20 ft (3.7-6 m)

Flowers

Clusters of fragrant, golden-yellow flower balls in late winter to early spring, usually January-March in mild Northern Hemisphere gardens and July-September in Australia.

Foliage

Evergreen, silver-blue leaves divided into small, feathery leaflets.

Growth

Fast

Care needed

Low

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife
• Fragrant

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Hard

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   8 ft (2.3 m)

3. After 2 years

   9 ft (2.6 m)

4. After 3 years

   10 ft (2.9 m)

5. After 5 years

   12 ft (3.5 m)

About 13 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

Australia

Invasive in

the US

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Fast

• Plant in spring in frost-prone gardens, keeping the root ball intact.
• Water deeply through the first growing season, letting the surface soil dry between waterings.
• Apply 2-3 in (5-8 cm) of mulch, keeping it clear of the trunk.
• Avoid routine feeding; rich soil and heavy fertilising encourage soft growth.
• Stake only where needed for stability, using a low stake and removing it once the roots hold firmly.
• Remove unwanted seedlings promptly, especially near natural vegetation.

Pruning. Prune lightly immediately after flowering, shortening leafy shoots and removing dead, damaged or crossing branches. Do not cut hard into old, leafless wood, which may not regrow reliably.

Late winter

Enjoy flowering; check young trees for frost damage but wait until frost risk has passed before removing damaged growth.

Early spring

After flowering, lightly shape the canopy and remove developing seed pods where practical.

Spring

Plant new trees after hard frosts, water thoroughly and mulch.

Summer

Deep-water young trees during dry spells; established trees usually need much less water.

Autumn

Pull up seedlings while small and check that stakes and ties are not rubbing the bark.

Winter

Protect young plants with horticultural fleece during brief cold snaps and keep the root zone free-draining.

• Use as a small specimen tree where the silver foliage can be seen against dark evergreen planting.
• Place behind drought-tolerant shrubs and grasses for a light, feathery canopy and winter colour.
• Combine with purple-flowered shrubs in a sunny gravel garden for contrasting foliage and flowers.
• Use in a mild-climate Australian planting, provided it is not invasive locally.

Garden styles it suits: Australian native, Mediterranean, Dry gravel garden, Winter interest, Desert / xeriscape and Wildlife garden.

Plant it with: Lavender, Rosemary, Rockrose, Westringia, Kangaroo paw and Lomandra.

Wildlife: Flowers provide pollen for bees and other insects, and the canopy offers cover for small birds. Outside its native range, its spread can displace local vegetation and reduce habitat quality.

• Root rot and decline in wet soil: improve drainage before planting and avoid frequent watering of established trees.
• Frost scorch or branch dieback: choose a sheltered site, protect young trees and prune damaged growth after frost risk passes.
• Scale insects and sooty mould: check stems and leaf undersides; treat accessible infestations with a labelled horticultural oil and avoid spraying during heat.
• Wind damage or unstable young trees: provide shelter, stake temporarily if necessary and remove weak or crossing branches while young.

Not known to be toxic to people, cats, dogs or horses, but reliable species-specific safety information is limited. Do not treat the seeds, pods, leaves or bark as edible, and prevent pets or livestock from browsing large amounts.

Where it spreads. Invasive in parts of southeastern and southwestern Australia outside its small native range around Cootamundra, New South Wales, including parts of Victoria, South Australia and Western Australia. It is also invasive in parts of California and South Africa, and has escaped cultivation in New Zealand. Check local weed lists before planting; it can also hybridise with other wattles.

• Silver wattle (Acacia dealbata)

  Usually a much larger tree with more finely divided leaves: each leaf generally has many more pairs of side divisions than the few broad pairs on Cootamundra wattle.

• Early black wattle (Acacia decurrens)

  Has greener, less silvery foliage and conspicuously ridged young stems; Cootamundra wattle has blue-grey leaves and less prominently ridged stems.

Cootamundra refers to its native district in New South Wales, while baileyana honours the botanist Frederick Manson Bailey.

Propagation. Usually grown from seed. Pour just-boiled water over the seeds, leave them to soak as the water cools overnight, then sow swollen seeds in a free-draining seed mix in warm conditions. Named forms may not come true from seed and are generally propagated by cuttings or grafting;

Accepted botanical name

Acacia baileyana

In the US and Canada

Introduced in the lower 48 states.

Native range

New South Wales.

Measured

Average height 520 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.