Cassia javanica subsp. agnes, commonly known as pink shower tree or apple blossom tree, is a fast-growing tropical tree native to Southeast Asia. The agnes subspecies is most valued as an ornamental for its larger, vibrant pink flowers that fade to white with age. Seed germination requires pre-treatment to overcome the hard, impermeable seed coat, followed by warm, moist conditions for successful establishment.
Before sowing
Mechanical scarification or hot water immersion required to overcome seed dormancy caused by impermeable seed coat
Sowing
What to expect
Tips
Use fresh seeds for best results; store-bought seeds should be pre-treated. Scarify seeds by rubbing with sandpaper or immerse in just-boiled water overnight before soaking. Do not allow seeds to dry out after soaking. Maintain soil temperature between 20-26°C for optimal germination. Seeds need light to germinate; do not cover entirely with substrate. Use artificial lighting (fluorescent or LED) if natural light is insufficient, avoiding direct sunlight. After germination, acclimatize seedlings gradually over 4-12 weeks before exposure to full sun. Protect young plants from frost as Cassia javanica is sensitive to cold temperatures. Keep soil consistently moist but not waterlogged to prevent root rot. Germination is typically rapid (5-30 days) when pre-treatment is properly performed, though some seeds may germinate much later. Ensure excellent drainage to prevent fungal issues. Seedlings benefit from gentle air circulation provided by opening pot covers regularly.
Sources: Tropical Plants Database; World Agroforestry Centre; Kew Science (Plants of the World Online); Grokipedia; Australian Seed; Gardening Know How; Seeds for Garden
