Agathis robusta - Evergreen Trees Direct

Agathis robusta

$150.00

Tax included. Shipping calculated at checkout.

Size: 30cm/33cm

30cm/33cm 40cm/45L 100L 400L 500L

Current Stock Height Guides

40cm/45L: 1.3m – 1.5m Approx.
100L: 2.6m - 3.4m 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 to 25m (to 40m in ideal conditions)

Mature Width: 5m to 8m

Agathis robusta is expected to grow 0.5m to 1m per year (fast in optimal subtropical conditions).

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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Email: sales@evergreentrees.com.au

Phone: (03) 7042 3318

About Your New Agathis robusta

Agathis robusta, the Queensland Kauri, is an Australian native conifer from the coastal and subtropical rainforests of Queensland. Unusually for a conifer it carries broad, glossy, leathery leaves rather than needles. Growth is strongly upright and symmetrical on a straight, clean trunk that thickens with age into an imposing column.

Expect 30 to 60 centimetres of growth a year in full sun and deep, well drained soil. It is at home in tropical, subtropical and warm temperate districts from Cairns through to Sydney, and grows well in sheltered Perth and coastal Melbourne gardens. It is frost sensitive, so young trees need a protected, frost free position.

Mature height is 15 to 25 metres with a spread of 5 to 8 metres, and up to 40 metres on ideal rainforest soils. That scale suits parkland, campus grounds, wide avenues and large lawns where the trunk can be seen from a distance. It gives shade and formal presence without the limb drop of many large trees.

Frequently Asked Questions

About Agathis robusta

What is Agathis robusta?

Agathis robusta, the Queensland Kauri, is a large evergreen conifer native to the rainforests of coastal and north Queensland. Unlike most conifers it carries broad, glossy, leathery leaves rather than needles. It grows with a strong central leader and a clean, straight trunk, and belongs to the ancient Araucariaceae family alongside the hoop and bunya pines.

How big does Queensland Kauri grow?

In cultivation expect 15 to 25 metres tall and 5 to 8 metres wide, and up to 40 metres on deep rainforest soils in ideal conditions. It is a long-lived tree that holds a narrow, upright profile for decades, so the width stays manageable on a landscape site even as the height builds.

Is Agathis robusta an Australian native?

Yes. It occurs naturally in two parts of Queensland, on the Atherton Tableland in the far north and in the Fraser Island and Maryborough district in the south east. That makes it a genuine local option for subtropical and warm temperate projects where a native conifer of real scale and presence is wanted.

Is Queensland Kauri frost tolerant?

No. It is frost sensitive and young trees can be set back or killed by frost, so choose a frost free or well sheltered position. In cooler districts, plant in a courtyard or on a north facing slope with some overhead protection, and hold stock in containers through the first winter or two if the site is exposed.

Does Agathis robusta flower?

Not in the usual sense. As a conifer it produces cones rather than flowers, with small catkin-like male cones and larger rounded female cones that break up on the tree to release winged seed. Cones only appear on mature specimens, so a young landscape tree will show none of this for many years.

How far apart should I plant Queensland Kauri?

For an avenue, 6 to 8 metres apart matches the 5 to 8 metre mature spread and lets each crown develop fully. Tighter spacing of about 3 metres is sometimes used where a continuous ranked line is wanted, but the crowns will merge and the lower branches will thin. As a single feature, allow 4 metres to any other tree.

How do I care for Agathis robusta?

Plant into deep, well drained soil in full sun and stake only if the site is windy. Water regularly through the first two or three summers and mulch well. Feed in spring with a balanced slow release fertiliser. Avoid pruning the leader, since the tree relies on it for form, and protect it from frost while young.

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.

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Uses in my Garden

Avenue Planting
Feature Tree
Shade Tree
Council or Civic Landscapes

Agathis robusta works in an:

Australian Native Garden – celebrates local plants with natural character.
Heritage / Traditional Garden – timeless, classic plantings for period homes.
Modern Garden – sleek, minimal, and design-led planting.

Is Agathis robusta Evergreen or Deciduous?

Agathis robusta is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 15m to 25m (to 40m in ideal conditions)

Mature Width: 5m to 8m

Agathis robusta is expected to grow 0.5m to 1m per year (fast in optimal subtropical conditions).

Growth Rate of Agathis robusta

Agathis robusta is expected to grow 0.5m to 1m per year (fast in optimal subtropical conditions).

They are considered to have a:

Medium Growth Rate
Fast Growth Rate

Frost Tolerance & Ideal Climate to plant Agathis robusta

Is Agathis robusta frost tolerant?

Agathis robusta is Frost Sensitive – May suffer damage from frost, best in frost-free or protected spots.

Does Agathis robusta Flower?

Agathis robusta produces very small, inconspicuous pale-yellow to cream flowers in spring, followed by rounded seed cones. While subtle, these seasonal structures sit high among the foliage and mark the tree’s natural reproductive cycle.

Does Agathis robusta flower?

No - Doesn't Flower

Flowering Period:

Not Applicable

Flower Type:

Not Applicable

Flower Colour:

Not Applicable

Is Agathis robusta an Australian Native Tree?

Yes

Agathis robusta is Native to Native to Queensland, Australia, occurring in subtropical and tropical rainforests from Maryborough north to Cape York.

What is the Wildlife Value of Agathis robusta ?

Its tall, dense evergreen canopy provides excellent shelter for small birds, while its seed cones support insects and cone-feeding species. The tree’s large structure helps create a stable, shaded micro-habitat that enhances biodiversity in both private gardens and larger landscapes.

How much Sunlight does Agathis robusta need?

Agathis robusta will thrive best in:

Full Sun

Preferred Soil?

Agathis robusta performs best in well-drained sandy or 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 enhance aeration and drainage. Keep soil evenly moist during establishment, then transition to deep, occasional watering as the tree matures and develops moderate drought resilience.

Is Agathis robusta Drought Tolerant?

Is Agathis robusta Drought tolerant?

As a young tree it requires consistent watering, but once established Agathis robusta develops moderate drought tolerance. It benefits from deep, occasional watering during extended dry periods to maintain canopy health and steady growth.

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How To Plant Your Agathis robusta

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 Agathis robusta

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.

Agathis robusta is expected to grow 0.5m to 1m per year (fast in optimal subtropical conditions).

Medium Growth Rate
Fast Growth Rate

Long Term Care For Your Agathis robusta

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 if used as hedging or screening. For a clear trunk feature, remove lower branches as the tree grows.

Fertilising: Apply a slow-release general-purpose fertiliser in early spring and again in autumn for steady growth and consistent foliage colour.

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

Planting Your Agathis robusta in Different Soil

Agathis robusta performs best in well-drained loam or sandy 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.