Description
A spectacular, large dry deciduous tree to about 40 m tall, native to eastern Australia which produces masses of bell-shaped, bright red flowers when in its leafless state. It is best suited to warm temperate climates and tolerate moderate freezes and drought conditions. It is easily grown from seed.
Germination Guide
🌍 Eastern Australia, New South Wales and Queensland coastal rainforests
Easy
Brachychiton acerifolius, commonly known as the Illawarra Flame Tree, is a spectacular deciduous tree native to subtropical rainforests of eastern Australia. Famous for its brilliant scarlet bell-shaped flowers that appear in clusters during spring and summer, the tree often sheds its leaves just before flowering, creating a stunning visual display. Germination is relatively easy when seeds are properly treated with hot water scarification.
Germination
Germination time
Expect germination in
14 – 42 days
Temperature
Min 20°C
Ideal 25°C
Max 30°C
Substrate moisture
💧 Medium
Seed Pre-treatment
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💧
Soaking — 24 hours
Water soaking is required as part of hot water scarification treatment to soften the seed coat and improve germination rates.
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🔨
Hot water scarification
Soak seeds in hot tap water (50-60°C) for 24 hours or immerse in just-boiled water for 30 seconds then transfer to lukewarm water for 24 hours. Boiling water can be used if hot water does not scarify the seed. If seeds have not imbibed after soaking, repeat process until they swell.
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📋
Additional notes
Hot water soaking is essential for scarification. Seeds have a hard outer coating requiring treatment to break dormancy.
Substrate & Container
Recommended substrate
Well-draining seed-raising mix, potting soil, peat, compost or combination with sand/perlite for drainage. Quality, light, porous and pathogen-free substrate recommended.
Recommended container
Plastic pots with transparent cover or mini-greenhouse to maintain constant humidity
Growing Tips
Scarification is critical—seeds have a hard coat that must be softened. Use hot tap water (50-60°C) soaking for 24 hours, or briefly immerse in just-boiled water followed by overnight soaking in lukewarm water. Sow seeds 1/4 inch (0.6cm) deep and tamp soil gently to ensure good contact. Keep substrate moist but not waterlogged to prevent seed rot. Use a transparent cover to maintain high humidity and consistent warmth (70-75°F ideal). Seeds are extremely susceptible to rot if substrate becomes soggy. Place in warm, semi-shaded position to prevent drying out. Gradually remove cover as seedlings emerge. Do not discard seeds that appear dormant—they may germinate after weeks or months. Germination can be erratic. Handle seeds with gloves as they are surrounded by irritant hairs in nature.
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