Acacia mearnsii seed | Black Wattle
LATIN NAME: Acacia mearnsii COMMON NAME: Black Wattle
Botanical Profile
Black wattle is native to southeastern Australia, where it grows into a fast, upright tree with dark, finely divided, fern-like bipinnate foliage and a dark, deeply furrowed trunk that gives the species its common name. Fragrant, bright yellow, ball-shaped flower clusters open in spring, followed by long, flattened, slightly constricted seed pods carrying numerous small hard seeds.
Science & Conservation
Black wattle bark is exceptionally rich in tannins, and this chemistry underpinned a major commercial tannin-extract industry in South Africa, Brazil and Kenya through the twentieth century, work that continues to inform tannin chemistry and natural leather-tanning research today. At the same time, because the species spreads readily and can dominate native vegetation once established, it has become one of the most intensively studied invasive trees in South African fynbos ecology, where large-scale clearing programmes are informed by decades of research into its seed-bank biology and regrowth patterns.
Landscape & Practical Uses
Black wattle remains commercially important in several countries as a source of bark tannin for leather processing and as a fast-rotation source of pulpwood and fuelwood, supporting rural livelihoods in parts of South Africa, Kenya and Brazil. Because it is classified as an invasive species in a number of regions outside its native Australian range, it is worth checking local regulations before planting it where it has not traditionally been grown.
Growing From Seed
Given how readily this species has naturalised well beyond its native range, it should come as no surprise that the seed germinates without fuss once a hot-water soak has softened the coat overnight; sow it into an ordinary loose, free-draining mix rather than anything specially formulated. Bright light and mild-to-warm temperatures suit the young seedlings well, and growth is typically fast, with the fine, dark, fern-like foliage that marks the species appearing within the first few true leaf sets.
Related Wattles
Explore other acacias in this collection: Acacia redolens (Prostrate Acacia, Bank Wattle), Acacia saligna (Golden Wreath Wattle, Blue-Leaved Wattle), Acacia auriculiformis (Earleaf Acacia, Papuan Wattle), Acacia dealbata (Silver Wattle, Mimosa).