Description
A variable, moderate, evergreen tree rarely more than 20 m tall with a dense crown of dark green phyllodes and spikes of cream white, scented flowers. Acacia melanoxylon is native to coastal eastern and southeastern Australia, including Tasmania. It makes a lovely ornamental for warm temperate and some tropial climates and is also planted for its beautiful, dark, high quality timber.
Germination Guide
🌍 Eastern and southeastern Australia, including Queensland, New South Wales, Victoria, South Australia, and Tasmania
Easy
Acacia melanoxylon (Australian Blackwood) is a fast-growing, evergreen timber tree native to southeastern Australia and valued for its high-quality dark wood. Seeds possess a hard, water-impermeable coat that requires scarification (breaking the seed coat through heat, mechanical abrasion, or chemical treatment) to initiate germination. With proper pre-treatment, germination rates can exceed 85-91%, making this species relatively easy to propagate from seed.
Germination
Germination time
Expect germination in
14 – 28 days
Temperature
Min 18°C
Ideal 20°C
Max 25°C
Substrate moisture
💧💧 High
Sowing depth
Lightly covered
Seed Pre-treatment
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💧
Soaking — 24 hours
Immerse seeds in hot water (boiling water treatment) for 1-2 minutes, then allow to cool in water overnight (12-24 hours). Alternatively, soak in hot water for 12-24 hours. Hot water treatment at 60 seconds exposure gives high germination percentages.
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🔨
Mechanical scarification
Mechanical scarification with sandpaper or nicking the seed coat is highly effective. Seeds that do not swell after soaking can be gently scarified and the process repeated. Scarified seeds achieve 85-91% germination rates.
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🔥
Smoke/Fire treatment
Fire-stimulated germination reaches up to 90% in natural conditions. Heat exposure stimulates seed dormancy breaking, simulating natural fire effects.
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📋
Additional notes
Hot water treatment (boiling water for 1-2 minutes followed by overnight soaking) or mechanical scarification with sandpaper. Hot water treatment is preferred as it more closely simulates natural fire conditions. Seeds require scarification to germinate successfully.
Substrate & Container
Recommended substrate
Well-draining seed-raising mix or high-quality germination substrate, light, porous, and free of pathogens
Recommended container
Plastic pot with transparent lid or covered seed tray to maintain consistent moisture
Growing Tips
Pre-treat seeds with hot water (boiling water for 1-2 minutes, then soak overnight) or mechanical scarification with sandpaper for best results. Sow seeds slightly covered in well-draining seed mix and keep substrate consistently moist. Maintain temperature around 18-25°C and provide bright light without direct sun exposure. Use a transparent-lid container to maintain high humidity. Germination typically occurs within 2-4 weeks. Do not discard seeds that fail to germinate immediately, as some may remain dormant until conditions mimic their natural environment. Acclimate seedlings gradually to outdoor conditions before transplanting to permanent locations. Fresh seeds germinate better than stored seeds. Avoid pressing seeds into substrate; allow them to rest on the surface after light covering.
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