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Illawarra Flame Tree

The Story

Plant Bio

Brachychiton acerifolius is a large, upright deciduous tree native to the east coast of Australia, characterized by a swollen, water-storing bottle-like trunk base and a dense, rounded canopy. The tree sheds its glossy, green leaves entirely before producing a dense display of bright coral-red, bell-shaped flowers on large panicles.

The adult foliage consists of leathery, shallowly lobed leaves up to twelve inches long, while juvenile leaves are deeply divided into five to seven lobes. New growth emerges bright green, contrasting with the smooth, pale green bark of younger branches.

Uses & Benefits:

Produces a spectacular canopy of bright red flowers on bare branches, followed by large, glossy green leaves.

The swollen trunk stores water, providing exceptional drought tolerance once the tree is established.

Flowers attract hummingbirds, bees, and other nectar-seeking insects in North American landscapes.

Essentials

At a Glance

Plant Type

Tree

Height

1378"

Width

590"

Light

Full Sun, Partial Sun

Zones

9, 10

Water

Low to moderate

Humidity

Tolerates high humidity

Lifespan

Long-lived

Native To

Australia

Toxicity

Skin irritant (seed pod hairs)

Bloom period

Spring – Summer

In flower about 6 months of the year

Planting

How to Grow

Plant in a full sun location with excellent drainage, as the water-storing trunk makes the tree highly susceptible to root rot in waterlogged soils.
Water regularly during the first two growing seasons to establish the taproot, then reduce watering to rely on the tree's natural drought tolerance.
Prune every three years for the first fifteen to twenty years to maintain a single dominant central leader and keep side branches small.
Wear heavy gloves and protective clothing when handling the woody seed pods to avoid contact with the highly irritating, star-shaped hairs inside.

Pro Tip

Never top this tree or make large pruning cuts into mature wood; the soft, spongy wood has poor decay compartmentalization and rots rapidly when injured.

Keep It Thriving

Care Guide

Do

Prune young trees regularly to establish a single dominant leader.
Wear gloves when handling mature seed pods to prevent skin irritation.
Ensure the planting site has high-drainage soil to prevent root rot.
Apply a balanced slow-release fertilizer sparingly in spring during establishment.

Don't

Do not prune into old, leafless wood on mature specimens.
Do not plant in low-lying areas prone to prolonged waterlogging.
Do not make large pruning cuts that expose mature wood to decay.
Do not panic when the tree drops all its leaves in spring, as this precedes flowering.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Pest Check
Plant
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Specimen TreeShade TreeStreet TreeCoastal Garden

Companion Plants

Agave americana Bougainvillea spectabilis Plumeria rubra

Multiply

Propagation Methods

Good to Know

Common Questions

Illawarra Flame Tree questions

What zones can Illawarra Flame Tree grow in?

Illawarra Flame Tree is hardy in USDA Zones 9–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Illawarra Flame Tree deer resistant?

Yes — Illawarra Flame Tree is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Illawarra Flame Tree bloom?

Illawarra Flame Tree typically blooms in spring through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Illawarra Flame Tree need full sun?

Illawarra Flame Tree does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Illawarra Flame Tree drought tolerant?

Yes — once established (usually after the first full season), Illawarra Flame Tree handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.