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phormium cookianum nz

Phormium cookianum NZ, also known as Mountain Flax or Wharariki, is a graceful and hardy native plant celebrated for its arching, green-lime leaves and its adaptability to New Zealand's varied landscapes. This stunning perennial is a favourite among gardeners and landscapers alike for bringing movement, texture, and a touch of wild New Zealand beauty to both coastal and inland gardens. Whether mass planted as groundcover, used to stabilise banks, or featured as part of a lush native border, Phormium cookianum is an essential choice for anyone looking to create vibrant, low-maintenance spaces that thrive in NZ conditions.

Phormium cookianum

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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. In summer, it produces yellow to orange tubular flowers that attract birds and pollinators. Hardy and tolerant of wind, salt, and poor soils, Wharariki thrives in full sun to part shade.

  • 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
Phormium 'Green Dwarf' flax plant in a native garden with Oioi plants.
Most Popular Phormium 'Green Dwarf'

Phormium 'Green Dwarf', also known as Dwarf Green Flax, is a compact, tidy New Zealand flax cultivar with lush, bright green, strap-like leaves. It...

From$16.13
Phormium 'Emerald Gem' in a native garden.
Most Popular Phormium 'Emerald Gem'

Phormium 'Emerald Gem' is a dwarf variety of Mountain Flax or Wharariki. It produces emerald-green leaves and grows to 60 cm tall and 70 cm wide in...

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A large Phormium 'Jester' plant with colourful foliage.
Most Popular Phormium 'Jester'

Phormium 'Jester' is a showy variety of Flax that produces leaves that are striped with a broad, pink central band and a dark purple border. This...

From$20.93
Phormium 'Rainbow Red' red and purple striped foliage.
Most Popular Phormium 'Rainbow Red'

Phormium 'Rainbow Red' is a vibrant New Zealand native flax admired for its bold, arching leaves in shades of bronze, red, and pink. This striking...

From$117.09
Phormium 'Surfer' plants in pots for sale at The Plant Company nursery.
Most Popular Phormium 'Surfer'

Phormium 'Surfer' is a compact New Zealand native flax admired for its striking green leaves edged with bronze and red tones. Its upright, arching...

From$18.23
Large Black Rage Phormium in a garden with black foliage.
Most Popular Phormium 'Black Rage'

Phormium 'Black Rage' is a striking New Zealand native flax known for its bold, upright leaves in deep shades of dark purple to near black. This...

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Phormium cookianum

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Native Beauty for Sustainable Planting

Phormium cookianum NZ stands out from other flax varieties with its softer, more pendulous foliage and its tolerance of damp soils, salt winds, and exposed sites. Growing up to 1.5 metres tall, it forms elegant clumps that provide year-round colour and structure. The summer flowering spikes produce yellow-green blooms, which are not only visually attractive but also prized by nectar-loving birds, making Wharariki a great option for wildlife-friendly planting projects.

Where to Plant Phormium cookianum in NZ Gardens

Mountain Flax is incredibly versatile, suiting a wide range of locations across New Zealand. It thrives in full sun or dappled shade and can cope with coastal, riparian, or wetland planting. Garden designers often use Phormium cookianum NZ to soften hardscape edges, cascade over retaining walls, or as a textural contrast among bolder native shrubs and grasses. Try combining it with striking companion plants like Dianella Streetscape or Libertia grandiflora (NZ Iris) for a robust, low-fuss planting palette.

Caring for Phormium cookianum NZ

One of the greatest advantages of Phormium cookianum is its resilience. It rarely suffers from pests or disease, requires little water once established, and copes well with pruning to rejuvenate tired leaves or limit size. For best results, plant in well-draining soil and add compost when planting. Phormium cookianum quickly forms dense clumps, suppressing weeds and providing lasting cover.

Explore Other Stunning Flax Varieties

Looking for a unique colour twist or different growth habit to complement your Mountain Flax? We offer a beautiful selection of NZ flax cultivars, including the red-bronze Phormium 'Evening Glow', compact Phormium 'Green Dwarf', neat Phormium 'Emerald Gem', and bold striped Phormium 'Jester'. For a modern look or smaller space, consider the gently arching Phormium 'Surfer' or the elegant Phormium 'Surfer Bronze'.

Create Your Native Oasis

By selecting Phormium cookianum NZ, you’re choosing a beautiful, sustainable plant that supports local biodiversity and ensures your garden or landscape is low-maintenance and full of character. Complete your native look with companion species like Libertia 'Grasshopper' or the robust Phormium 'Wildwood' (Wildwood Flax), and enjoy the best of New Zealand’s natural flora for years to come.


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.

–The Plant Company

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