Description
A well known and popular, very fast growing ornamental tree to 15 m tall, native to eastern Australia with dark green, bipinnate, feathery foliage and wonderfully scented, golden yellow flowers in great profusion in early spring. Seeds should be scarified or briefly immersed in boiling water before sowing.
Germination Guide
🌍 Eastern New South Wales, Australia
Easy
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.
Germination
Germination time
Expect germination in
5 – 25 days
Temperature
Min 18°C
Ideal 25°C
Max 22°C
Substrate moisture
💧💧 High
Sowing depth
Lightly covered
Seed Pre-treatment
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💧
Soaking — 18 hours
Pour boiling water over seeds and allow to soak overnight (12-24 hours). Once swollen, the seed is ready to be sown.
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🔨
Mechanical scarification
Mechanical scarification using sandpaper, nail clippers, or gentle knocking can be used. Seeds that don't swell may be gently scarified and the imbibition process repeated.
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📋
Additional notes
Hot water treatment (boiling water followed by overnight soaking) is most practical. Alternative: mechanical scarification followed by warm water imbibition for 12-24 hours.
Substrate & Container
Recommended substrate
High-quality germination substrate, light, porous, and pathogen-free. Suitable media include germination paper, sand, perlite, or sphagnum moss.
Recommended container
Transparent plastic container with lid to maintain constant moisture. Petri dishes or plastic bags work well.
Growing 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.
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