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phormium cookianum black adder

Phormium cookianum Black Adder is a striking New Zealand native flax that brings dramatic colour and structure to gardens across Aotearoa. This exceptional selection of Phormium cookianum is highly sought-after for its deep, almost black, arching leaves and elegant form, making it perfect for contemporary landscapes, naturalistic plantings, and container displays. With its resilient nature and contrasting foliage, Phormium cookianum Black Adder is an ideal choice for gardeners looking to add both visual impact and low-maintenance reliability to their outdoor spaces.

Phormium cookianum

4.5 from 2 customers

Phormium cookianum, commonly known as Mountain Flax or Wharariki, is a graceful New Zealand native valued for its arching green leaves and tall flower spikes. It typically grows 1–1.5 metres tall and wide, making it ideal for borders, mass plantings, or coastal gardens.

From $14.95

Suited to regions: All regions
Plant type: Flaxes
Height: 1.50 m
Spread: 1.50 m
Flowering time: Summer
Tolerances: Coastal, Extended dry periods, Hardy, Wet, Wind
Garden uses: Banks, Living areas, Ponds
Garden styles: Backyard, City & Courtyard, Coastal, Frontyard, Modern, Native, Riparian
A large Phormium 'Dark Delight' plant with elegant, purple foliage.

Phormium 'Dark Delight'

5 from 3 customers

Phormium 'Dark Delight', also known as Dark Purple Flax, is a bold New Zealand native flax prized for its broad, upright leaves in deep purple to bronze shades. This striking ornamental variety brings drama, colour, and structure to gardens year round.

From $19.95

Suited to regions: All regions
Plant type: Flaxes
Height: 1.20 m
Spread: 1.20 m
Flowering time: Summer
Tolerances: Coastal, Extended dry periods, Hardy, Wet, Wind
Garden uses: Living areas, Parks, Ponds, Pool areas, Specimen
Garden styles: Architectural, Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Mediterranean, Modern, Native, Riparian
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Search phormium cookianum black adder

Features and Benefits of Phormium cookianum Black Adder

Phormium cookianum Black Adder showcases slender, arching leaves in an intense black-purple hue that holds its colour year-round. Reaching around 75cm to 1m in height, this medium flax offers a compact, clump-forming habit that suits both mass plantings and feature positions. Like other Phormium cookianum selections, Black Adder is valued for its tolerance to wind, coastal conditions, and drought once established. During summer, mature plants produce elegant flower spikes that attract native birds and pollinators.

Planting and Care

Phormium cookianum Black Adder thrives in a range of New Zealand conditions, preferring full sun to part shade and tolerant of most well-drained soils. While established plants handle dry spells, regular watering helps young flaxes settle and flourish. Mulch around the roots to conserve moisture and suppress weeds, and trim back old or damaged leaves in late winter to encourage fresh new growth. With minimal care, this robust cultivar remains healthy and vibrant throughout the year, making it a fantastic choice for low-maintenance gardening.

Design Uses for Black Adder Flax

Phormium cookianum Black Adder brings a sculptural silhouette and bold colour contrast that instantly lifts modern garden designs. Use it to line pathways, in mixed native plantings, or as a standalone statement in pots. The deep-toned foliage pairs beautifully with silvery grasses, green-flowered perennials, and vibrant natives. For dramatic planting combinations, try mass planting with other dark-leafed flaxes like Phormium 'Platts Black' or Phormium 'Black Magic', or integrate with classic green forms such as Phormium colensoi and Phormium cookianum hookeri.

Why Choose New Zealand Grown Phormium Flax

By selecting Phormium cookianum Black Adder from a trusted local nursery, you support New Zealand’s thriving native plant industry and ensure your plants are selected for robust performance in Kiwi climates. With a wide range of Phormiums on offer, including favourites like Phormium cookianum, Phormium cookianum hookeri, Phormium colensoi, Phormium 'Platts Black', and Phormium 'Black Magic', you can create harmonious, enduring plantings that celebrate the beauty and resilience of our native flora.

Phormium cookianum Black Adder offers the perfect blend of bold aesthetics, hardiness, and versatility, making it a standout choice for New Zealand gardeners seeking both style and substance in their landscapes.

Contact us

Whether you need assistance finding the plant you’re looking for or you simply want to know more about who we are and what we do, we invite you to get in touch with us today. A member of The Plant Company team will get back in touch as soon as possible.

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Garden icons like Coprosma 'Hawera' (Sand Coprosma) and Griselinia 'Ardmore Emerald' lead the way, but there’s magic in discovering Cornus 'Stokes Pink', Phaseolus caracalla, and Camellia sasanqua 'Paradise Diana'.
–The Plant Company

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