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Brachychiton acerifolius (Illawarra Flame Tree)

About Your New Brachychiton acerifolius (Illawarra Flame Tree)

Brachychiton acerifolius, the Illawarra Flame Tree, is a large Australian native with a straight trunk and a broad crown of glossy lobed leaves. In warmer summers it sheds much of that foliage and clothes the bare branches in scarlet bell flowers, which is the display the tree is known for.

It grows best in full sun on deep, free draining soil and suits warm temperate and subtropical gardens through coastal New South Wales and Queensland. Young trees need protection from frost, although established specimens take light frosts in their stride. Growth is around 50 to 100 centimetres a year, and mature trees are notably drought hardy.

The scale suits parks, rural properties, large gardens and civic landscapes, and it works as an avenue or street tree where the canopy has room. Allow 3 to 4 metres between trees for avenue work, more for a specimen. Buyers choose it for a summer flowering event that no other shade tree in the catalogue matches.

Frequently Asked Questions

About Illawarra Flame Tree

What is the Illawarra Flame Tree?

Brachychiton acerifolius is an Australian native tree from the rainforest margins of the east coast, in the family Malvaceae. It is grown for the mass of scarlet bell shaped flowers it carries in early summer, usually on bare or half bare branches. The leaves are glossy and deeply lobed, and older trees develop a thick, buttressed trunk.

How big does Brachychiton acerifolius grow?

In good ground it reaches 15 to 25 metres tall with a crown 8 to 12 metres across, so it is a tree for open space rather than a courtyard. Growth in cultivation is often slower and shorter than in habitat, but the mature footprint should still be planned for. Compact hybrids are available where the room is not there.

Is it evergreen or deciduous?

It is best described as semi deciduous. In most seasons it drops the majority of its leaves in late spring, flowers on the bare framework, then pushes new foliage straight afterwards. In warm frost free gardens the leaf drop can be partial and brief. In cooler districts the tree can stand bare for several weeks.

When does it flower?

Flowering runs from late spring into early summer, generally November through to January depending on the season and district. The display is triggered by warm dry conditions, so it is heavier in some years than others, and young trees often take several years before their first real flush. Flowers are followed by boat shaped seed pods.

Is it frost tolerant?

Only moderately. Established trees cope with light frosts, but young stock is easily damaged by hard or repeated frost and should be protected through its first few winters. It is a warm climate tree by origin, so cold inland sites with heavy frost are not its natural fit. Plant where cold air drains away rather than settling.

Does it have invasive roots?

The root system is not regarded as aggressive. Trees develop a thick tuberous taproot when young and a spreading anchoring system as they mature, and they are not known for lifting paving or entering drains. Even so, the trunk thickens considerably with age, so allow several metres of clearance from kerbs, footings and services.

How do I care for an Illawarra Flame Tree?

Water deeply through the first two summers to establish the root system, then it needs little supplementary water. Mulch out to the drip line and keep the mulch off the trunk. Prune only to remove damaged wood or to lift the canopy while the tree is young. A light application of a native fertiliser in spring is enough.

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Uses in my Garden

  • Feature Tree
  • Shade Tree
  • Rural Property Planting
  • Avenue Planting
  • Council or Civic Landscapes
  • Street Tree

Brachychiton acerifolius (Illawarra Flame Tree) works in an:

  • Australian Native Garden – celebrates local plants with natural character.
  • Tropical Garden – lush, leafy planting for a resort-style atmosphere.
  • Modern Garden – sleek, minimal, and design-led planting.
  • Low-maintenance Garden – resilient choices for easy care and year-round appeal.

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