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phormium cookianum green

Phormium cookianum green, also known as Mountain Flax or Wharariki, is a stunning native New Zealand plant prized for its lush, upright green foliage and graceful, arching form. Perfect for adding a touch of wild elegance to both contemporary and traditional garden designs, this versatile flax offers year-round structure, hardy resilience, and unique visual texture. Whether used as a specimen plant, mass-planted for ground cover, or incorporated into low-maintenance landscapes, Phormium cookianum green is a favourite among landscapers and home gardeners alike.

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
A large Phormium 'Evening Glow' plant in a garden.
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Phormium 'Evening Glow'

Phormium 'Evening Glow' is a variety of Flax that produces long and broad, sword-like leaves that are coloured various shades of pink and red with a...

From$20.93
Phormium 'Green Dwarf' flax plant in a native garden with Oioi plants.
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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...

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Phormium 'Emerald Gem' in a native garden.
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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.
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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...

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Phormium 'Surfer' plants in pots for sale at The Plant Company nursery.
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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...

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Phormium 'Jack Spratt' plants for sale at The Plant Company nursery.
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Phormium 'Jack Spratt'

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Phormium 'Pink Panther'

Phormium Pink Panther produces long, sword like leaves that are candy pink with red-bronze margins. This Flax typically grows to 1.2 m tall and the...

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Cordyline australis 'Red Star' plants with fabulous dark red-purple foliage.
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Phormium cookianum

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Why Choose Phormium cookianum green?

If you’re seeking a native flax with true sophistication, Phormium cookianum green ticks every box. Its rich, evergreen blades typically grow to around 1–1.5 metres tall, making it a little more compact and softer in form than other larger flax varieties. Unlike the more upright New Zealand flax (Phormium tenax), Mountain Flax has a softer, cascading habit, ideal for mixed native gardens, coastal projects, or riparian planting. It’s unfussy about soil, tolerant of wind and coastal exposure, and once established, highly drought-tolerant—a true champion for windy hillsides or tough spots in the garden.

Design Ideas and Plant Combinations

Phormium cookianum green works beautifully in naturalistic plantings and coastal landscapes, where its fresh green hue creates a striking backdrop for flowering natives and contrasting textures. Try underplanting with robust grasses or pairing with flax cultivars like Phormium 'Evening Glow' for a pop of red foliage. For compact spaces or modern borders, blend in Phormium 'Green Dwarf' or Phormium 'Emerald Gem' for textural variety. Looking for more drama? The bold stripes of Phormium 'Jester' or the deep burgundy of Cordyline Cabernet offer fantastic contrast.

Easy Care for New Zealand Conditions

One of the best features of Phormium cookianum green is its adaptability to almost any garden setting. It thrives in both full sun and part shade, prefers free-draining soil, and handles periodic wet feet, which makes it ideal for swales or rain gardens. To keep plants looking their best, simply remove any spent or damaged leaves at the base in late winter or early spring. Mulch annually to suppress weeds and retain soil moisture. Phormium cookianum green is remarkably tough against pests and diseases, a key reason it’s cherished in New Zealand public and private gardens.

Explore More Flax Varieties

For gardeners seeking diversity in colour and height, our range of NZ flax includes compact cultivars like Phormium 'Surfer', vibrant options like Phormium 'Sunset Dreams', and striking blues and purples such as Phormium 'Purple Haze' (Purple Flax Plant) and Phormium 'Surfer Boy' (Surfer Boy Flax). Consider mixing in natives like Dianella Stampede for grass-like foliage and small, attractive flowers.

Phormium cookianum green is a timeless choice for New Zealand gardens, offering beauty, resilience, and habitat value for native birds and insects. Explore the full potential of native planting with our specialist selections, and enjoy a flourishing, low-maintenance landscape 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.

You’ve probably heard of our garden favourites like Zephyranthes candida and Griselinia 'Ardmore Emerald', but did you know we also grow hidden gems like Aloe hereroensis, Fraxinus excelsior aurea, and Cupressus Blue Ice (Blue Arizona Cypress)?
–The Plant Company

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