black tree fern nz

About Cyathea medullaris

Cyathea medullaris, the black tree fern NZ, thrives in the temperate rainforests of New Zealand. It can grow up to 20 metres tall, making it the largest tree fern in the country. Its trunk, which is notably black and fibrous, is topped with graceful, bright green fronds that can span several metres. The Mamaku adapts well to moist, sheltered gardens, and is highly valued for its dramatic, tropical appearance and resilience in shaded conditions.

Growing Black Tree Fern NZ in Your Garden

The black tree fern NZ prefers rich, well-drained soils and a sheltered, damp environment. For best results, plant your Mamaku where it is protected from harsh winds and direct sunlight, mimicking the dappled light of a native forest. Regular watering—especially during dry spells—supports lush frond growth. Mulch around the base to conserve moisture and suppress weeds, and avoid disturbing the roots, as Cyathea medullaris dislikes transplanting.

When planning a fern garden or native revegetation area, you can pair the black tree fern NZ with other stunning ferns like Cyathea dealbata (Punga), which features iconic silver undersides to its fronds, or Cyathea smithii (Ponga Fern), known for its delicate foliage and smaller stature.

Landscaping Uses

Mamaku is ideal for large gardens, woodland landscapes, and restoration projects where you want to create a layered, natural aesthetic. Its towering trunk and umbrella-like canopy provide habitat for native birds and shade for understory plants. Surround your Mamaku with lush companions such as Pellaea rotundifolia (Button Fern) or Polystichum vestitum (Prickly Shield Fern) to achieve a thriving, multi-dimensional fernery.

For Australian-inspired gardens, consider planting alongside Cyathea australis or Cyathea cooperi (Australian Tree Fern), which share similar growing requirements but display unique textures and colours.

Explore More Tree Ferns

If you love the grandeur of the black tree fern NZ, you might also enjoy exploring other remarkable species in our collection. Discover the elegant Cyathea tomentosissima, the compact Blechnum 'Silver Lady' (Dwarf Tree Fern), or the distinctive Davallia tasmanii with its furry rhizomes.

Each fern has its own personality and niche in the garden, so whether you're restoring native bush, designing a shaded courtyard, or simply adding architecturally bold plants, the black tree fern NZ and its companions are the perfect choices for New Zealand gardens.

Shop Cyathea medullaris (Black Tree Fern NZ)

Bring the wild beauty of the NZ rainforest to your outdoor space. Browse our selection of Cyathea medullaris and other premium ferns—cultivate a landscape that's rich in native character, resilience, and year-round tranquility.