Acacia catechu, commonly known as Black catechu or Khair, is a deciduous thorny tree native to South Asia and Southeast Asia, growing up to 15 meters in height. The species is valued for its heartwood extract (cutch and katha) used in tanning, dyeing, and traditional medicine, as well as for timber and fodder production. Its seeds have a hard, impermeable coat requiring pre-sowing treatment such as hot water immersion to achieve successful germination.
Before sowing
Hot water treatment (80°C for 10 minutes) followed by 12-24 hour warm water soak is most effective. Mechanical scarification with light sanding or nicking is acceptable alternative if seeds do not swell after soaking.
Sowing
What to expect
Tips
1) Pre-treat seeds with hot water (80°C for 10 minutes) for best results (91% germination); cold water soaking alone yields lower rates (69.6%). 2) Maintain warm temperatures (20-30°C, ideally 25°C) and bright indirect light during germination. 3) Use well-draining substrate to prevent waterlogging; seeds prefer slightly moist but not soggy soil. 4) Germination typically occurs within 2-3 weeks with proper pre-treatment; unsoaked seeds take much longer. 5) Once seedlings develop 3-4 sets of true leaves, transplant to larger containers with nutrient-rich soil. 6) Harden off seedlings gradually before planting outdoors; protect from frost. 7) Young seedlings require consistent moisture but established plants are drought-tolerant. 8) Direct sowing is possible but pre-germinated seeds in nursery beds provide better survival rates.
Sources: Research studies from Bangladesh Agricultural University, World Agroforestry Centre, Plants for a Future, Feedipedia, IUCN Red List, and horticultural guides on Acacia catechu propagation
