Eucalyptus robusta – Swamp Mahogany - Evergreen Trees Direct

Eucalyptus robusta – Swamp Mahogany

$265.00

Tax included. Shipping calculated at checkout.

Size: 40cm/45L

40cm/45L 100L

All stock is grown, maintained and graded in strict accordance with AS 4373-2007, Australian Standard for Nursery Stock.

Current Stock Height Guides

40cm/45L: 1.4m – 2.1m Approx.
100L: 1.7m – 3m 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: 15m - 30m Approximately

Mature Width: 8 – 12 meters

Eucalyptus robusta – Swamp Mahogany is expected to grow Approx. 1 – 1.5 m per year.

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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Shipping

Shipping is calculated at checkout based on the pallet space your order occupies in the truck and your delivery location.

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Contact

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Email: sales@evergreentrees.com.au

Phone: (03) 7042 3318

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About Your New Eucalyptus robusta – Swamp Mahogany

Eucalyptus robusta, known as Swamp Mahogany, is a fast-growing and hardy Australian native tree perfectly suited for wetter or coastal environments. Reaching heights of 15–25 meters with a broad 8–12 meter canopy, it offers dense, glossy evergreen foliage and creamy-white flowers from winter to spring that attract pollinators and support local wildlife.

Its remarkable tolerance to waterlogged, clay, and acidic soils makes it a dependable choice for challenging sites such as wetlands and coastal buffers. Thriving in full sun and withstanding light frost and coastal exposure, Swamp Mahogany requires low maintenance and moderate to high moisture, especially during establishment.

This tree looks excellent in landscapes where resilience meets natural beauty — ideal for shelterbelts, windbreaks, feature planting, and habitat restoration. If you want a reliable, fast-growing tree that enhances biodiversity while providing year-round shade and structure, Eucalyptus robusta is a standout performer.

Enriched Planting Mix (AO Certified)

$21.95

Features and Benefits

Organically certified product
Improves aeration for roots
A rich blend of Pure Magic Compost, composted animal manure, Gypsum, composted coarse bark and wetting agent
Excellent to mix with heavy clay soils, an organic mixture with added gypsum which is perfect for exotic plants
Revitalises tired soils, adds nutrient and organic matter, no chemical additives, weed free
Assists in retaining moisture in the soil longer after rain or watering

Directions For Use

Water plant well at least several hours prior to planting.
Dig a hole at least twice the width of the pot and 7cm deeper than the pot.
Mix Grow Better Enriched Planting Mix with the soil that has been dug out of the hole, adding about 1/3 planting mix.
Spread a 7cm layer of improved soil in the hole and remove plant from the pot. Tease roots gently if the root ball is very firm and place plant in the planting hole. Check that pot soil is level with the surrounding soil surface level, not higher or lower.
Fill in the hole with improved soil mixture, firm down soil and water well adding Grow Better Plant Starter to final watering.

View full details

Type:

Enriched Planting Mix (AO Certified)

$21.95

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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 - 30m Approximately

Mature Width: 8 – 12 meters

Eucalyptus robusta – Swamp Mahogany is expected to grow Approx. 1 – 1.5 m per year.

Growth Rate of Eucalyptus robusta – Swamp Mahogany

Eucalyptus robusta – Swamp Mahogany is expected to grow Approx. 1 – 1.5 m per year.

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.

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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 Approx. 1 – 1.5 m per year.

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.

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.