Description
Tree flamboyant bottle, more commonly known in its region of origin as delonix adansonoides, is an exemplar of unique beauty and extremely ornamental.
Its bottle-shaped trunk up to 80 centimeters in diameter and fragrant and showy flowers also qualify it for bonsai art.
In their original habitat, the trunks are sometimes excavated to make canoes, the seeds are recorded as edible, and the resin is used as glue to seal the canoes.
The species is native to southern Madagascar. It is found in a narrow strip along the northern coast from toliara to tolagnaro amid xerophytic vegetation (vegetation adapted to aridity).
Delonix decaryi is listed as vulnerable in the iucn list, it does not qualify for a threatened category based on geographical distribution, but its habitat is fragmented and degraded. The main threats are large-scale logging and charcoal production, selective logging, increased cultivation, and cattle grazing are also leading to further degradation of their habitat.
The species grows satisfactorily in soils that promote good or excellent drainage, full sun and periodic irrigations in its first year in cultivation. It is tolerant to partial shading. It is not tolerant to frost and temperatures below 2º c for long period of time.
Delonix decaryi is a magnificent specimen and still very rare in cultivation.
Germination Guide
🌍 Southern Madagascar, dry deciduous forests
Moderate
Delonix decaryi, native to southern Madagascar, is a striking deciduous tree with a distinctive bottle-like trunk and vibrant white, yellow, and orange-red flowers. Seeds have a hard coat requiring scarification or hot water treatment to improve germination rates significantly. Under proper conditions with warm temperatures and adequate moisture, germination typically occurs within 1-4 weeks.
Germination
Germination time
Expect germination in
7 – 28 days
Temperature
Min 20°C
Ideal 25°C
Max 35°C
Substrate moisture
💧 Medium
Seed Pre-treatment
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💧
Soaking — 24 hours
Soak seeds in lukewarm water for 24 hours after scarification; seeds should imbibe moisture and swell
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🔨
Mechanical scarification
Lightly scarify seeds with sandpaper at one point until color change is visible; alternatively use hot water treatment
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📋
Additional notes
Hot water treatment (pour nearly boiling water on seeds, cool to warm temperature, soak 24 hours) is highly effective; alternatively mechanical scarification followed by warm water soaking
Substrate & Container
Recommended substrate
Fast-draining potting mix, vermiculite, or sandy loam soil
Recommended container
Seed tray or small pots with drainage holes
Growing Tips
Scarify seeds lightly with sandpaper or treat with nearly boiling water (cool to warm) before soaking. Maintain warm temperatures between 20-35°C, optimally 25°C. Use well-draining substrate to prevent seed rot. Keep soil consistently moist but not waterlogged during germination. A heating mat can accelerate germination. Handle young seedlings carefully as they are fragile. Germinated seeds showing white radicles should be potted immediately for best success.
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