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Eucalyptus robusta – Swamp Mahogany

Eucalyptus robusta – Swamp Mahogany

Most loved for its thick, textured bark and clusters of creamy-white flowers that provide abundant nectar for wildlife.

Regular price $300.00
Sale price $300.00 Regular price
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Pot size
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Size: 40cm/45L
Current height guide
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Pot size
40cm/45L

Approximate only. Minimum height important? Confirm with us.

Height guide & disclaimer

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 must confirm 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.

Quantity

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Size / batchEachQuantity
40cm/45LApprox. height: Enquire for current heights$300.00
100LApprox. height: Approx. 2.4m – 4.0m$2,690.00

Height guide & disclaimer

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 must confirm 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.

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    About Eucalyptus robusta

    Eucalyptus robusta is the eucalypt to plant where the ground stays wet. Swamp Mahogany tolerates periodic inundation and heavy clay that would kill most trees, while producing masses of cream nectar-rich flowers through winter and spring that are a critical food source for gliders, flying foxes and honeyeaters.

    Eucalyptus robusta grows fast at 1 to 1.5 metres per year, reaching 15 to 30 metres tall and 8 to 12 metres wide, with thick spongy red-brown bark that persists to the small branches. It is a tree for parkland, rural properties, revegetation and large civic landscapes rather than suburban gardens.

    This Australian native grows in full sun, tolerates light to moderate frost once established, and handles coastal exposure and salt-affected ground. Once away it needs no intervention, which is why it is a standard choice for large-scale habitat and shelterbelt planting.

    Frequently Asked Questions

    About Eucalyptus robusta

    How big does Eucalyptus robusta grow?

    Swamp Mahogany reaches 15 to 30 metres tall and 8 to 12 metres wide. It is a large tree and should be sited on acreage, parkland or revegetation sites rather than a suburban block.

    Does Eucalyptus robusta tolerate wet soil?

    Yes. This is its defining strength. It handles periodic waterlogging, heavy clay and seasonally inundated ground that would kill most other eucalypts.

    How fast does Swamp Mahogany grow?

    Very fast, at 1 to 1.5 metres per year in suitable conditions. It is often used where quick canopy cover or habitat replacement is needed.

    When does it flower and what feeds on it?

    Cream flowers appear through winter and spring. They are a key nectar source for honeyeaters, lorikeets, gliders and flying foxes, particularly in the leaner winter months.

    Is Eucalyptus robusta an Australian native?

    Yes. It is native to the coastal swamps and estuarine margins of eastern Australia and is widely used in habitat restoration along that range.

    Is it suitable for coastal sites?

    Yes. It tolerates coastal exposure and salt-affected ground well, which is why it appears naturally in estuarine and back-dune positions.

    How far apart should I plant Eucalyptus robusta?

    Plant 6 to 8 metres apart for a shelterbelt or revegetation planting, and at least 10 metres from buildings, services and paving given its eventual size.

    Foliage

    Evergreen (foliage year round)

    Position
    • Full Sun
    Form
    • Upright
    • Spreading
    Use
    • Avenue Planting
    • Council or Civic Landscapes
    • Rural Property Planting
    • Revegetation or Regeneration
    • Shade Tree
    Mature height
    15m to 30m (approx.)
    Mature width
    8m to 12m

    Planting Information

    How To Plant Your Eucalyptus robusta – Swamp Mahogany

    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 Eucalyptus robusta – Swamp Mahogany

    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.

    Eucalyptus robusta – Swamp Mahogany is expected to grow 1m to 1.5m per year (approx.).

    • Fast Growth Rate

    Long Term Care For Your Eucalyptus robusta – Swamp Mahogany

    Watering: Water deeply twice weekly through the first 12 months. Once established, reduce to once weekly in dry periods. Mulch helps maintain consistent moisture.

    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 Eucalyptus robusta – Swamp Mahogany in Different Soil

    Eucalyptus robusta 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.

    Uses in my Garden

    Uses in my Garden

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

    Eucalyptus robusta – Swamp Mahogany 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.

    Is Eucalyptus robusta – Swamp Mahogany Evergreen or Deciduous?

    Eucalyptus robusta – Swamp Mahogany is an Evergreen (foliage year round) Tree

    Mature Height & Width

    Mature Height: 15m to 30m (approx.)

    Mature Width: 8m to 12m

    Eucalyptus robusta – Swamp Mahogany is expected to grow 1m to 1.5m per year (approx.).

    Growth Rate of Eucalyptus robusta – Swamp Mahogany

    Eucalyptus robusta – Swamp Mahogany is expected to grow 1m to 1.5m per year (approx.).

    They are considered to have a:

    • Fast Growth Rate

    Frost Tolerance & Ideal Climate to plant Eucalyptus robusta – Swamp Mahogany

    Is Eucalyptus robusta – Swamp Mahogany frost tolerant?

    Eucalyptus robusta – Swamp Mahogany is Frost Tolerant – Can handle light to moderate frost once established.

    Does Eucalyptus robusta – Swamp Mahogany Flower?

    Eucalyptus robusta produces clusters of creamy-white fluffy flowers from winter into early spring. These nectar-rich blooms appear along the branchlets and provide a soft but valuable seasonal display that contrasts well with its dark green foliage and thick, fibrous bark.

    Does Eucalyptus robusta – Swamp Mahogany flower?

    • Yes - Flowers

    Flowering Period:

    • Winter
    • Spring

    Flower Type:

    • Pollinator-attracting
    • Clustered

    Flower Colour:

    Cream

    Is Eucalyptus robusta – Swamp Mahogany an Australian Native Tree?

    Yes

    Eucalyptus robusta – Swamp Mahogany is Native to Eastern Australia, from southern Sydney through coastal New South Wales into Queensland, where it grows naturally in swamps, floodplains, and wet coastal forests.

    What is the Wildlife Value of Eucalyptus robusta – Swamp Mahogany ?

    Its winter–spring flowering period supplies abundant nectar for honeyeaters, lorikeets, native bees and early-season pollinators. The dense evergreen canopy provides excellent shelter and nesting habitat for small birds, while the rugged bark supports insects and microfauna that enhance biodiversity in wetland and coastal gardens.

    How much Sunlight does Eucalyptus robusta – Swamp Mahogany need?

    Eucalyptus robusta – Swamp Mahogany will thrive best in:

    • Full Sun

    Preferred Soil?

    Eucalyptus robusta performs best in moist, well-drained loam or sandy loam soils and prefers slightly acidic to neutral conditions. Naturally adapted to wetter sites, it may struggle in very dry or compacted clay soils unless improved with organic matter to enhance both drainage and moisture retention. Keep soil consistently moist during establishment, then maintain deep, reliable watering as the tree matures to support healthy growth, winter flowering and long-term resilience.

    Is Eucalyptus robusta – Swamp Mahogany Drought Tolerant?

    Is Eucalyptus robusta – Swamp Mahogany Drought tolerant?

    As a young tree it requires regular watering, and once established Eucalyptus robusta develops moderate drought tolerance. Naturally adapted to moist, swampy and coastal environments, it performs best with deep, occasional watering during dry periods to maintain strong canopy health and steady growth.

    Frequently Asked Questions

    Frequently Asked Questions

    Q: Can Eucalyptus robusta tolerate wet or waterlogged soil?
    A: Yes, it thrives in moist to wet conditions, making it ideal for coastal and poorly drained sites.

    Q: Is Eucalyptus robusta suitable for coastal or windy locations?
    A: Yes, it tolerates coastal exposure and strong winds well.

    Q: How fast does Eucalyptus robusta grow?
    A: It has a fast growth rate, often exceeding 1m per year in optimal conditions.

    Q: Does Eucalyptus robusta attract wildlife?
    A: Yes, its flowers are highly attractive to birds, bees, and other pollinators.

    Q: Can Eucalyptus robusta be used in shelterbelts or windbreaks?
    A: Absolutely – it is well-suited for shelterbelts, windbreaks, and wetland buffers.

    Compare sizes side by side

    40cm/45L

    Enquire for current heights

    100L

    Approx. 2.4m – 4.0m

    Heights are approximate and vary between individual trees.

    Eucalyptus robusta is loved for its thick, textured bark and clusters of creamy-white flowers that provide abundant nectar for wildlife.

    We take pride in supplying A+ grade advanced trees. When stock at our farm is not yet ready, we work with our trusted trade suppliers to source the best available trees for your garden.

    Plant Your Eucalyptus robusta – Swamp Mahogany With:

    Enriched Planting Mix (AO Certified)

    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.

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