Senna alata, commonly known as Candle Bush or Ringworm Bush, is a fast-growing tropical shrub native to Central and South America. The species possesses a hard seed coat causing physical dormancy; however, with appropriate scarification and imbibition treatments, it germinates readily and consistently, making it moderately easy to propagate from seed.
Before sowing
Scarification is essential for overcoming seed coat dormancy. Both mechanical and hot water treatments are effective. For maximum germination rates (94-100%), mechanical or chemical scarification strongly recommended.
Sowing
What to expect
Tips
Ensure good air circulation during germination to minimize fungal growth. Keep soil moist but not waterlogged. Seedlings develop rapidly and can be transplanted once they have 2-3 true leaves. The species is extremely fast-growing and thrives in warm climates with full sun exposure. Seeds have exceptional viability when properly stored. Remove seedpods before they split to prevent unwanted volunteer seedlings, as this species can self-seed prolifically.
Sources: Kew Royal Botanic Gardens (2016), CABI Compendium, research on Senna alata seed dormancy and germination
