Acacia Mearnsii - Black Wattle - Evergreen Trees Direct

Acacia Mearnsii - Black Wattle

Name: Acacia Mearnsii - Black Wattle
Brand: Evergreen Trees Direct
Price: 265.00 AUD
Availability: InStock

$265.00

Tax included. Shipping calculated at checkout.

987 in stock

Size: 40cm/45L

40cm/45L

Current Stock Height Guides

40cm/45L: 2m – 2.5m Approx.

Trade Customers

We supply advanced trees to landscapers, developers, architects, and councils Australia-wide. Trade clients receive fast quotes, expert advice, and access to premium stock with reliable freight.

About Acacia Mearnsii - Black Wattle

The Acacia mearnsii – Black Wattle is a fast-growing, evergreen native tree (6–10m H × 4–6m W) with a dense, rounded canopy and fine-textured, dark green bipinnate foliage. It looks excellent in rural landscapes, large native gardens, or along boundary lines where fast coverage, shade, or shelter is needed. Bright yellow, ball-shaped flowers appear from late winter to early spring, attracting pollinators and adding strong seasonal contrast.

Acacia mearnsii – Black Wattle thrives in full sun to part shade and adapts to poor, dry, or degraded soils. Drought-tolerant once established and ideal for windbreaks, erosion control, reforestation, and habitat planting.

Use where rapid establishment and resilience are priorities. Best suited to larger areas—avoid in confined or formal garden spaces.

Key Information to Know

Evergreen / Deciduous

Acacia Mearnsii - Black Wattle is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 6–10 m

Mature Width: 4m – 6m

Acacia Mearnsii - Black Wattle is expected to grow Approx. 80 – 120 cm/year (Very fast).

Frost Tolerance

Is Acacia Mearnsii - Black Wattle frost tolerant?

Acacia Mearnsii - Black Wattle is Frost Hardy – Survives heavy and frequent frost without damage.

Flowering Information

Acacia mearnsii produces abundant pale-yellow globular flowers through late winter and spring. The blooms form in dense clusters along the fine, ferny foliage, creating a soft yet impressive seasonal display that brightens the cooler months.

Native Information

Is Acacia Mearnsii - Black Wattle an Australian Native? Yes

Acacia Mearnsii - Black Wattle is Native to South-eastern Australia, including Victoria, Tasmania, New South Wales, and South Australia, where it grows naturally in open forests, woodlands, and along watercourses.

Wildlife Value

Its dense, spreading canopy offers valuable shelter for small birds, while its pollen-rich flowers attract native bees, beetles and beneficial insects that contribute to a healthy, biodiverse garden ecosystem.

Sunlight Information

Acacia Mearnsii - Black Wattle will thrive best in:

Full Sun

Preffered Soil

Acacia mearnsii performs best in well-drained sandy or loam soils and tolerates slightly acidic to neutral conditions. It may struggle in heavy clay or poorly drained areas unless improved with organic matter to boost aeration and drainage. Keep soil evenly moist during establishment, then reduce watering as the tree matures and becomes more drought resilient.

Botanical Information

Common Name: Acacia cognata

Genus: Acacia

Botanical Species: mearnsii

Family: Fabaceae

Botanical Name: Acacia mearnsii

Landscape Uses

Screening or Privacy
Windbreak
Rural Property Planting
Revegetation or Regeneration

Acacia Mearnsii - Black Wattle works in an:

Australian Native Garden – celebrates local plants with natural character.
Woodland Garden – layered, naturalistic design under dappled light.
Wildlife Garden – planting to attract birds, bees, and pollinators.
Low-maintenance Garden – resilient choices for easy care and year-round appeal.

Planting, Spacing & Care

Planting Tips: Ensuring a Strong Start:

Site Selection: Full sun position for best growth.
Digging the Hole: Twice as wide as the root ball, same depth.
Planting: Place tree at ground level, backfill, and water thoroughly.
Mulching: Maintain a 5–7 cm mulch layer, clear of the trunk.
Watering: Deep water weekly during first year.

Hedging & Screening: Plant 1.5 m apart for tall, informal screening.

Feature Tree: Plant 2 m apart to showcase tree form.

Avenue Planting Trees:Can be used in rural or naturalistic avenues.

Caring For Your Tree:

Watering: Regular during establishment; minimal once established.
Fertilizing: Low-phosphorus native fertilizer in spring if needed.
Pruning: Prune after flowering or as needed to maintain structure.
Mulching: Refresh mulch annually.

How to grow in different soil types:

Sandy Soil: Thrives with mulch and regular watering during establishment.
Clay Soil: Amend with organic matter to improve drainage.
Loamy Soil: Perfect for fast growth and strong establishment.
Rocky or Coastal Soil: Handles poor soils once mature.
pH Range: Neutral to slightly acidic preferred.

Acacia Mearnsii - Black Wattle is expected to grow Approx. 80 – 120 cm/year (Very fast).

Fast Growth Rate

Root Ball Dimensions (Width × Depth) For Planting

Use this as a reference when digging your planting hole. We recommend digging at least 10% wider than the dimensions below to encourage strong root development.

30cm Pot: 33cm (W) × 30cm (D)
40cm/45L Pot: 44cm (W) × 41.5cm (D)
50cm Pot / 70L Pot: 55cm (W) × 41.8cm (D)
100L Bag: 50.6cm (W) × 52.8cm (D)
150L Bag: 66cm (W) × 55cm (D)
200L Bag: 71.5cm (W) × 60.5cm (D)
300L Bag: 88cm (W) × 63.8cm (D)
400L Bag: 99cm (W) × 66cm (D)
500L Bag: 122cm (W) × 66cm (D)
750L Bag: 134cm (W) × 69cm (D)
1000L Bag: 146.3cm (W) × 71.5cm (D)
2000L Bag: 176cm (W) × 82.5cm (D)

Ideal Conditions

Inland QLD (Darling Downs, Central QLD)
Northern NSW (Byron, Coffs, Armidale)
Inland NSW / Tablelands (Orange, Bathurst, Canberra)
Sydney & Central Coast
South Coast NSW (Illawarra to Bega)
Melbourne & Surrounds (Metro, Bayside, Geelong, Bellarine, Mornington)
Western District & Central VIC (Ballarat, Bendigo, Hamilton)
Gippsland (Latrobe Valley, East Gippsland)
Alpine / High Country (Bright, Mansfield)
Adelaide Metro & Coastal
Adelaide Hills & Barossa
Riverland & Murraylands
Limestone Coast & South East

Thrives in

Full Sun

Frost Tolerance

Frost Hardy – Survives heavy and frequent frost without damage.

Drought Tolerance

As a young tree it benefits from regular watering, but once established Acacia mearnsii develops good drought tolerance. It remains resilient through dry periods and performs reliably in low-maintenance landscapes with minimal supplementary watering.