Seed Characteristics and Dormancy Breaking Methods
Gulmohar produces flat, woody, dark-brown pods measuring 40 to 60 cm in length containing 20 to 40 elongated, hard-coated seeds.
Because the seed coat is impervious to water (physical dormancy), un-treated seeds can lie in the soil for months before germinating.
Subjecting seeds to hot water soaking or mechanical scarification softens the coat, enabling water imbibition and rapid embryo emergence.
- Hot water treatment: Immerse seeds in hot water (80 degrees Celsius) for 2 to 3 minutes, then soak in normal water overnight.
- Mechanical nicking: Carefully clip or file a tiny notch in the hard outer seed coat away from the embryo eye to allow water entry.
- High germination rate: Treated seeds achieve 75% to 90% germination within 6 to 12 days after sowing.
- Nursery potting mix: Sow in polybags filled with a loose, well-drained mix of sandy loam, vermicompost, and river sand.
Nursery Management, Sapling Growth, and Field Planting
Gulmohar seedlings grow rapidly under full sunlight, requiring regular watering and protection from cold winds.
Saplings reach ideal field planting height (1 to 1.5 meters) within 4 to 6 months of nursery raising.
- Field spacing: Plant along avenues, farm boundaries, and homestead perimeters spaced 8 to 10 meters apart.
- Pit excavation: Dig 60 cm x 60 cm x 60 cm planting pits enriched with compost and anti-termite bio-agents before the monsoon.
- Staking: Stake young saplings with bamboo or fiberglass poles during the first two seasons to guide a straight central trunk.
- Flowering maturity: Trees begin their magnificent scarlet summer flowering flushes at 4 to 5 years of age.
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Common questions
Why do Gulmohar seeds require hot water treatment before sowing?
Gulmohar seeds possess a hard, waterproof seed coat; soaking in hot water softens the coat, allowing water to enter for rapid germination.
How long does a treated Gulmohar seed take to sprout?
Scarified or hot-water treated seeds typically germinate in 6 to 12 days when sown in warm, moist nursery media.
How many years does a seed-grown Gulmohar tree take to flower?
Seed-propagated Gulmohar trees typically begin flowering in their fourth or fifth year under warm tropical conditions.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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