Golden wattle

Sun

Full sun; tolerates light shade but flowers less freely.

Water

Water regularly while establishing; once established, give occasional deep watering during prolonged dry weather. Avoid constantly wet soil.

Soil

Well-drained sandy or loamy soil, preferably slightly acidic to neutral. Avoid waterlogged ground and strongly alkaline soil.

Height

13-26 ft (4-8 m)

Spread

10-20 ft (3-6 m)

Flowers

Fragrant, golden-yellow balls carried in clusters in late winter and spring; usually July-October in Australia and roughly February-April in mild Northern Hemisphere gardens.

Foliage

Evergreen. Glossy green, broad, sickle-shaped phyllodes—flattened leaf stalks that function as leaves. Young seedlings initially carry finely divided true leaves.

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

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Fast

• Plant in a sunny position sheltered from strong, cold winds.
• Water deeply during dry spells through the first one or two growing seasons, then reduce watering.
• Apply organic mulch over the root area, keeping it clear of the trunk.
• Avoid routine feeding; on very poor soil, use a small amount of low-phosphorus fertiliser formulated for Australian native plants.
• Stake only if the young tree is unstable, and remove supports once its roots provide firm anchorage.
• Remove unwanted seedlings promptly, particularly near bushland or other natural areas.

Pruning. Immediately after flowering, lightly shorten young shoots if needed to encourage a bushier crown. Remove dead or damaged branches, but avoid severe cutting into old, bare wood because regrowth is unreliable.

Autumn

Plant where winters are mild and soil drains freely; water thoroughly and mulch.

Winter

Protect young plants from forecast frost and check that the root area is not waterlogged.

Late winter

Check developing flower clusters and young shoots for aphids.

Spring

After flowering, lightly shape young plants and remove dead branches.

Summer

Deep-water young trees during dry spells; water established trees only during extended drought.

Late summer

Remove unwanted seedlings and inspect stressed branches for borer holes or dieback.

• Use as a flowering specimen in a sunny, frost-sheltered lawn or gravel garden.
• Plant as a loose screen with room for its spreading crown rather than clipping it into a formal hedge.
• Combine with bottlebrushes, native grasses and low-growing grevilleas in an Australian native planting.
• Place against a dark evergreen backdrop to show off the golden flowers in late winter.

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

Plant it with: Crimson bottlebrush, Coastal rosemary, Spiny-headed mat-rush, Kangaroo grass and Kangaroo paw.

Wildlife: Flowers supply pollen for bees and other insects. In Australia, birds visit glands on the phyllodes for nectar, while the branches provide shelter and nesting sites.

• Root rot and sudden decline: avoid wet sites, improve drainage before planting and do not keep the root area constantly moist.
• Borers in stressed or ageing trees: maintain suitable watering, remove badly affected branches and seek an arborist's advice if the trunk is damaged.
• Aphids or scale insects: check young growth, encourage natural predators and treat accessible infestations with a labelled horticultural soap or oil if needed.
• Frost damage: choose a sheltered position, protect young plants during cold snaps and wait until spring growth begins before removing damaged shoots.

Not generally known to be toxic to people, cats or dogs, but species-specific safety information is limited. Do not treat the seeds, pods, bark or foliage as food, and do not offer prunings to horses or other livestock; their safety as fodder is not established.

Where it spreads. Invasive in South Africa and Portugal, and an environmental weed in parts of Western Australia outside its native range. It can form dense stands from long-lived seed; check local restrictions and avoid planting beside natural vegetation where it is a weed.

• Golden wreath wattle (Acacia saligna)

  Usually has longer, narrower, often blue-green phyllodes and a more drooping habit; golden wattle has broader, glossy green, strongly curved phyllodes.

• Coastal golden wattle (Acacia leiophylla)

  A close relative with generally narrower phyllodes and hairy young branchlets; golden wattle usually has broader phyllodes and hairless branchlets.

• Silver wattle (Acacia dealbata)

  Has finely divided, fern-like silver-grey leaves rather than the broad, undivided green phyllodes of mature golden wattle.

The species name pycnantha comes from Greek words meaning 'dense-flowered', referring to its crowded flower heads.

Propagation. Grow from seed after breaking the hard seed coat: pour just-boiled water over the seeds, remove them from the heat and leave them to soak overnight. Sow swollen seeds in a free-draining seed mix; handle seedlings gently and plant out while young.

Accepted botanical name

Acacia pycnantha

In the US and Canada

Introduced in the lower 48 states.

Native range

New South Wales, South Australia and Victoria.

Measured

Average height 540 cm.

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