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.
Before sowing
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.
Sowing
What to expect
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.
Sources: Burrows et al. (2009) Australian Journal of Botany; Arán et al. (2017) Annals of Forest Science; CSIRO Publishing; Sheffield's Seed Company; multiple horticultural propagation guides
