Acacia decurrens, commonly known as black wattle or Sydney green wattle, is a fast-growing Australian tree native to New South Wales. Seeds have a hard, water-impermeable coat requiring pre-treatment to break dormancy. With proper hot water treatment, this species germinates reliably and quickly, making it ideal for both commercial afforestation and ornamental purposes.
Before sowing
Hot water treatment (boiling water followed by overnight soaking) is most practical. Alternative: mechanical scarification followed by warm water imbibition for 12-24 hours.
Sowing
What to expect
Tips
Sow in well-lit location but avoid direct sunlight. Use transparent container with lid to maintain humidity. Fluorescent lighting can be used if natural light is insufficient. Check daily for germination, typically appearing within 2-5 weeks. Do not discard seeds that don't germinate immediately—dormancy can persist. Acclimate seedlings gradually before planting in permanent location. Fresh seeds (less than 2-3 years old) show higher germination rates. Keep substrate moist but not waterlogged.
Sources: Australian Tree Seed Centre (ATSC 1998), Southern Biological, Gardening Know How, Dave's Garden, USDA Forest Service, Wikipedia
