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.
Before sowing
Hot water soaking is essential for scarification. Seeds have a hard outer coating requiring treatment to break dormancy.
Sowing
What to expect
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.
Sources: Sheffield's Seed Co., Australian Seed Store, Garden Guides, Australian Native Plants Society, Flame Tree germination guides
