Acacia melanoxylon - Blackwood Acacia - Evergreen Trees Direct

Acacia melanoxylon - Blackwood Acacia

$120.00

Tax included. Shipping calculated at checkout.

Size: 30cm/33cm

30cm/33cm 40cm/45L 100L 200L

Current Stock Height Guides

40cm/45L: 1.6m – 1.8m Approx.
100L: Enquire within for height guide information.
200L: 3m – 3.5m Approx.

Height guide disclaimer: Height ranges are approximate only. As living products, plant heights naturally vary between individual plants, batches, and seasons. No guarantee is given that supplied plants will fall within the stated range. If minimum heights are required, you mustconfirm current batch heights with Evergreen Trees Direct prior to purchase. Variation in height is normal and is not grounds for return, refund, replacement, or compensation.

Mature Height & Width

Mature Height: 6m to 30m

Mature Width: 4m to 10m

Acacia melanoxylon - Blackwood Acacia is expected to grow 1.5m to 2.4m per year under optimal conditions (approx.)..

Root Ball Dimensions

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)

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Phone: (03) 7042 3318

About Your New Acacia melanoxylon - Blackwood Acacia

Acacia melanoxylon, the Blackwood, is a large evergreen Australian native tree with a straight upright trunk and a dense canopy of broad dark green phyllodes. It carries pale cream to soft yellow ball flowers in late winter and spring, and produces the dark, close grained timber that gave the tree its name.

It grows in full sun in clay, loam or sand, tolerates low fertility and moderate drought, and takes frost well, which suits it to cool and temperate districts through the south east. Growth is fast, often more than a metre a year while the tree is young, then steadying as the crown fills out.

Blackwood is planted for shelterbelts, erosion control, biodiversity corridors and large scale revegetation, and it makes a substantial canopy tree in rural gardens and public open space. It is a tree for room, not for a suburban block. Where genuine height, shade and durability are required, few natives are as proven.

Frequently Asked Questions

About Blackwood Acacia

What is Acacia melanoxylon?

Acacia melanoxylon, known as Blackwood, is a tall evergreen Australian native tree from the pea family. It occurs naturally from Tasmania up through the east coast, forming an upright trunk with a dense canopy of broad phyllodes. It is valued for shelterbelts, revegetation and shade, and for its dark, fine grained furniture timber.

How big does Blackwood Acacia grow?

It reaches 6 to 30 metres tall and 4 to 10 metres wide. The upper figures apply to deep, moist forest soils in cool districts, while open paddock and garden trees typically settle in the lower half of that range. Either way this is a large tree, so plan for the eventual canopy from the start.

How fast does it grow?

Growth is fast for a large tree, commonly more than a metre a year while young in good conditions with reasonable soil moisture, then slowing as the crown broadens. Most of the early vigour goes into height. Trees planted in dry, shallow or exposed ground put on considerably less and stay shorter overall.

Does it have invasive roots?

It does need care. The root system is vigorous and Blackwood suckers freely from roots, particularly if they are cut or disturbed by cultivation. Keep it well away from paving, drains, service trenches and building footings, and expect suckers in lawn or garden beds nearby. In open rural planting this habit is far less of a concern.

Is it frost tolerant?

Yes. Blackwood grows naturally in cool climates including Tasmania and the highlands of the mainland south east, and it handles regular frost without damage once established. Young trees are more exposed and benefit from shelter for their first winter in the coldest districts. It is one of the more cold hardy of the larger wattles.

Where does it grow best in Australia?

It performs best in cool and temperate regions, including Tasmania, Victoria, the New South Wales tablelands and coastal escarpment, south east South Australia and the cooler parts of the south west. It wants reasonable rainfall and reliable drainage, and grows on clay through to sand. Hot arid inland districts are outside its comfortable range.

How do I care for Blackwood Acacia?

Water through the first two summers to establish the root system, then it largely looks after itself. Form prune while young to hold a single central leader and remove low or crossing limbs before they thicken. Avoid cultivating around the base, which triggers suckering, and keep mulch clear of the trunk collar.

Enriched Planting Mix (AO Certified)

$21.95

Enriched Planting Mix is a certified organic blend of Pure Magic Compost, composted animal manure, gypsum, composted coarse bark and a wetting agent, bagged in 30L. It is built to be dug through existing garden soil at planting time rather than used on its own, and the gypsum is what sets it apart from a plain compost.

Gypsum helps break up heavy clay so water and roots can move through it, while the compost and manure return organic matter and nutrient to tired ground. The coarse bark holds structure and keeps air around the root zone, and the wetting agent keeps moisture in the soil longer after rain or watering.

Use it when planting trees, shrubs, roses, fruit trees and exotic garden plants, particularly into clay. Dig a hole twice the width of the pot and 7 centimetres deeper, then mix roughly one third planting mix through the excavated soil. Spread 7 centimetres of that improved soil in the base before setting the plant in.

Frequently Asked Questions

About Enriched Planting Mix

What is Enriched Planting Mix made from?

It is a blend of Pure Magic Compost, composted animal manure, gypsum, composted coarse bark and a wetting agent. Each part has a job. The compost and manure supply organic matter and nutrient, the gypsum works on clay structure, the bark keeps air around the roots and the wetting agent holds moisture in the soil.

What plants is it suitable for?

It suits exotic garden plants, including roses, ornamental and deciduous trees, fruit trees, shrubs and perennials, and it earns its keep most on heavy clay sites. It is a planting mix rather than a potting mix, so its job is improving soil at planting time. Phosphorus sensitive natives are the one clear exception.

Is it safe for natives?

No, not for the phosphorus sensitive ones. The composted animal manure in this blend lifts phosphorus well above what Proteaceae such as Banksia, Grevillea, Hakea and Protea will tolerate, and the result can be leaf burn, dieback and plant death. Use the Native Potting Mix for those species, or plant them into unimproved local soil.

Is it certified organic?

Yes. It is a certified organic product with no chemical additives, which is why the manure and compost in it are fully composted rather than raw. That makes it sound around fruit trees and vegetable beds, and it means you are adding genuine organic matter to your soil rather than a synthetic conditioner.

How much do I need?

Work on roughly one third planting mix to two thirds of the soil you dug out of the hole. For a shrub out of a 200 millimetre pot that is only a few litres. An advanced tree going into a large hole will take considerably more. Judge the quantity by the volume of the hole rather than the size of the plant.

Can I use it in pots?

It is not a potting mix and should not be used on its own in a container. The blend is designed to be diluted through garden soil, and used straight in a pot it holds too much water and settles badly. For containers, reach for a premium potting mix, or the native mix if you are potting natives.

Does it need to be watered in?

Yes. Water the plant well several hours before you plant it, then water thoroughly again once the hole is backfilled and the soil firmed down. That first deep watering settles the improved soil around the root ball and drives out air pockets. Keep the water up over the first few months while the roots establish.

View full details

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Enriched Planting Mix (AO Certified)

$21.95

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Uses in my Garden

Shade Tree
Avenue Planting
Screening or Privacy
Council or Civic Landscapes
Rural Property Planting
Revegetation or Regeneration

Acacia melanoxylon - Blackwood Acacia works in an:

Australian Native Garden – celebrates local plants with natural character.
Woodland Garden – layered, naturalistic design under dappled light.
Formal Garden – structured, symmetrical design with clipped shapes.
Low-maintenance Garden – resilient choices for easy care and year-round appeal.

Is Acacia melanoxylon - Blackwood Acacia Evergreen or Deciduous?

Acacia melanoxylon - Blackwood Acacia is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 6m to 30m

Mature Width: 4m to 10m

Acacia melanoxylon - Blackwood Acacia is expected to grow 1.5m to 2.4m per year under optimal conditions (approx.)..

Growth Rate of Acacia melanoxylon - Blackwood Acacia

Acacia melanoxylon - Blackwood Acacia is expected to grow 1.5m to 2.4m per year under optimal conditions (approx.)..

They are considered to have a:

Fast Growth Rate

Frost Tolerance & Ideal Climate to plant Acacia melanoxylon - Blackwood Acacia

Is Acacia melanoxylon - Blackwood Acacia frost tolerant?

Acacia melanoxylon - Blackwood Acacia is Frost Hardy – Survives heavy and frequent frost without damage.

Does Acacia melanoxylon - Blackwood Acacia Flower?

Acacia melanoxylon produces pale cream to soft yellow globular flowers from late winter into early spring. The blooms appear in small clusters along the foliage, adding a gentle seasonal display that complements its dark, glossy green phyllodes.

Does Acacia melanoxylon - Blackwood Acacia flower?

Yes - Flowers

Flowering Period:

Spring
Summer

Flower Type:

Fluffy

Flower Colour:

Yellow

Is Acacia melanoxylon - Blackwood Acacia an Australian Native Tree?

Yes

Acacia melanoxylon - Blackwood Acacia is Native to South-eastern Australia, including Tasmania, Victoria, South Australia, and New South Wales, where it grows in woodlands, forests, and along riverbanks.

What is the Wildlife Value of Acacia melanoxylon - Blackwood Acacia ?

Its dense canopy offers excellent shelter for small birds and marsupials, while its pollen-rich flowers support native bees, hoverflies and beneficial insects that help sustain healthy biodiversity in the landscape.

How much Sunlight does Acacia melanoxylon - Blackwood Acacia need?

Acacia melanoxylon - Blackwood Acacia will thrive best in:

Full Sun
Part Shade

Preferred Soil?

Acacia melanoxylon performs best in well-drained loam or sandy loam soils and prefers slightly acidic to neutral conditions. It may struggle in heavy clay or poorly drained areas unless improved with organic matter to boost structure and drainage. Keep soil evenly moist during establishment, then gradually reduce watering as the tree matures and develops moderate drought tolerance.

Is Acacia melanoxylon - Blackwood Acacia Drought Tolerant?

Is Acacia melanoxylon - Blackwood Acacia Drought tolerant?

As a young tree it benefits from regular watering, but once established Acacia melanoxylon develops moderate drought tolerance. It copes well with intermittent dry periods, though it performs best with occasional deep watering during extended drought.

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How To Plant Your Acacia melanoxylon - Blackwood Acacia

Site: Choose a well-drained position in full sun to part shade with room for the canopy to develop.

Soil preparation: Enrich the planting area with quality compost and aged manure for a strong establishment phase.

Hole: Dig twice as wide as the root ball and the same depth.

Planting: Position level with the surrounding soil, backfill gently, firm in, then water deeply to settle the roots.

Recommended Planting Spacing For Your Acacia melanoxylon - Blackwood Acacia

Feature tree: 3 to 4 metres apart to allow the full canopy and form to develop.

Avenue planting: 3 metres apart for a uniform soft-textured avenue.

Acacia melanoxylon - Blackwood Acacia is expected to grow 1.5m to 2.4m per year under optimal conditions (approx.)..

Fast Growth Rate

Long Term Care For Your Acacia melanoxylon - Blackwood Acacia

Watering: Water deeply twice weekly through the first 12 months. Once established, this is drought tolerant and only needs a deep soak during extended dry periods.

Mulching: Apply a 5 to 7 centimetre layer of organic mulch over the root zone, keeping it 5 centimetres clear of the trunk.

Pruning: Minimal pruning required. Light tip prune in late winter to maintain shape, and remove lower branches as the tree grows to develop a clean feature trunk.

Fertilising: Apply a slow-release native blend in early spring and again in autumn. Avoid high-phosphorus formulations as a precaution.

Pest and disease: Hardy against most pests and diseases. Occasional inspection in warm humid conditions is all that's needed.

Planting Your Acacia melanoxylon - Blackwood Acacia in Different Soil

Acacia melanoxylon performs best in well-drained sandy loam or loam with a slightly acidic to neutral pH. Adaptable to a wide range of soils when drainage is improved with organic matter.

Sandy soil: Free-draining and ideal. Mulch well to maintain consistent moisture.

Clay soil: Improve drainage with gypsum and organic compost before planting.

Loam: The preferred soil for steady root development and consistent growth.

pH: Slightly acidic to neutral preferred. Mulch with composted leaf litter to maintain levels naturally.

Frequently Asked Questions

Q. Is this tree suitable for hedging or screening?
A. It’s not used for formal hedging but can be planted 4 – 5 m apart for windbreaks or informal large-scale screening.

Q. How fast does Acacia melanoxylon grow?
A. It grows at a moderate pace of around 50 – 80 cm per year, with faster growth in ideal conditions.

Q. What makes it a good feature tree?
A. Its tall, upright structure and dense green foliage provide shade, structure, and seasonal flowers in spring to early summer.

Q. Is it drought-tolerant?
A. Yes, once established, it can tolerate moderate drought conditions.

Q. What are the flowers like and when do they appear?
A. Small pale yellow flowers appear from spring to early summer, offering subtle seasonal interest.

Q. Does it tolerate frost or poor soil?
A. Yes, it’s highly adaptable, tolerates a wide range of soils, and is frost-resistant once mature.

Q. What kind of maintenance does it need?
A. It is generally low-maintenance, requiring regular watering when young and minimal pruning once mature.