Description
Considered by some to be the worlds most beautiful tree, this large, partially dry deciduous tree from lowland forests in northern and western Madagascar forms a huge, spreading crown with finely pinnate foliage and beautiful red flowers that cover the entire plant for several weeks before the new leaves appear. A popular and easily grown ornamental, widely planted around the world in tropical climates in USDA Zones 10 and above. Seeds should be scarified or immersed in boiling water to break dormancy, then soaked at room temperature for a day.
Germination Guide
🌍 Madagascar
Moderate
Delonix regia, commonly known as the Royal Poinciana or Flame Tree, is a striking tropical tree native to Madagascar with brilliant red-orange flowers and fern-like foliage. The species exhibits seed dormancy due to its hard seed coat and requires pre-treatment to achieve reliable germination. With proper hot water scarification and consistent warm temperatures, germination typically occurs within 2-3 weeks, making it moderately easy to propagate from seed.
Germination
Germination time
Expect germination in
4 – 20 days
Temperature
Min 21°C
Ideal 24°C
Max 29°C
Substrate moisture
💧 Medium
Seed Pre-treatment
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Soaking — 24 hours
Submerge scarified seeds in hot water at approximately 110°F (43°C) for 24 hours. Select only those seeds that have visibly swollen; re-treat any non-responsive seeds with fresh hot water. Avoid over-soaking as seeds may rot if soaked longer than 24 hours.
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🔨
Hot water scarification
Submerge seeds in hot tap water (around 110°F/43°C) and leave to soak for 24 hours. Any seeds that have not swollen should be placed in fresh hot water and soaked again. Alternatively, mechanical scarification on the rounded end using sandpaper or nail clippers can be combined with hot water soaking. Boiling water can be used if hot tap water does not scarify the seed adequately.
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Additional notes
Pre-treatment is essential. Seeds have a hard, woody testa that requires scarification plus hot water immersion to break dormancy. Hot water treatment for 20 minutes combined with mechanical scarification produces optimal results.
Substrate & Container
Recommended substrate
Well-draining potting mix or peat moss with perlite
Recommended container
Seed tray or small pots with drainage holes; propagation trays recommended for later transplanting
Growing Tips
Select imbibed seeds that have visibly swollen after hot water treatment; discard non-responsive seeds. Sow imbibed seeds 1/4 inch (approximately 0.6 cm) deep, tamp soil firmly, and mulch the seed bed. Provide bright, indirect light and maintain soil moisture without waterlogging. Use a heating mat to maintain consistent temperatures between 70-85°F (21-29°C) for optimal germination. Once scarified, seeds are sensitive to extended soaking; limit immersion to 24 hours maximum. Avoid scarifying the pointed end where the radicle emerges; scarify only the rounded end. Young seedlings grow rapidly and will develop several feet of growth in their first year if not contained.
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