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mountain flax plant

The mountain flax plant is a striking native of New Zealand, admired for its graceful arching leaves and resilience in a range of garden settings. Naturally elegant, this variety of flax brings soft texture and movement to landscapes, creating a connection to our country's wild, beautiful mountains. Whether mass-planted for dramatic effect or used as an accent, the mountain flax plant stands out for its versatility, low maintenance requirements, and value to both garden design and local ecosystems.

Phormium cookianum

5 from 1 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. 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 'Emerald Gem' in a native garden.

Phormium 'Emerald Gem'

4.8 from 4 customers

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 full sun on a well-drained site. This dwarf flax is often added to mixed plantings and borders, used in coastal gardens, planted to accentuate water features such as ponds and streams, or grown around pool and barbecue areas.

Suited to regions: All regions
Plant type: Flaxes
Height: 60 cm
Spread: 70 cm
Flowering time: Summer
Tolerances: Coastal, Extended dry periods, Hardy, Wet, Wind
Garden uses: Banks, Borders, Living areas, Parks, Paths & Steps, Patios, Ponds, Pool areas, Specimen
Garden styles: Architectural, Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Mediterranean, Modern, Native, Riparian
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Phormium 'Green Dwarf' flax plant in a native garden with Oioi plants.

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From$16.13
Phormium 'Surfer Bronze' plants for sale at The Plant Company nursery.

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From$18.23
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Search mountain flax plant

What is the Mountain Flax Plant?

The mountain flax plant refers to Phormium cookianum, a native species often found on hillsides, riverbanks, and coastal regions across Aotearoa. With its longer, narrower leaves and more drooping habit than the more robust Phormium tenax, it offers a softer look, perfect for naturalistic gardens. The mountain flax plant thrives in both sun or partial shade and adapts well to a range of soils, making it a popular choice for both home gardeners and landscapers seeking reliable, easy-care structure.

Mountain Flax Plant Features and Benefits

The mountain flax plant is prized for several key qualities: - Graceful, arching leaves often in green or bronze shades depending on the variety - Tolerance of wind, salt spray, and drought, ideal for exposed gardens and coastal planting - Nectar-rich tubular flowers that attract native birds such as tui and bellbirds, supporting biodiversity - Useful as a low-maintenance groundcover or in mass plantings for erosion control on banks and slopes - Adaptability to container gardening and urban environments

If you're looking for a dazzling dwarf selection, Phormium 'Pepe' (Dwarf Flax) is a gorgeous compact option that maintains the signature mountain flax look in smaller spaces.

Mountain Flax Plant in the Garden

Designers love the mountain flax plant for its understated beauty and movement. Group several together at the edge of a pond, or combine with NZ natives such as hebes, astelia, and carex for an authentic, layered effect. This plant is especially valued in eco-sourced planting schemes where both form and function are important. With regular mulching, the mountain flax plant needs little else aside from the occasional tidy up of spent leaves.

For a darker foliage choice, consider the striking Phormium 'Evening Glow', or for a more vivid presence, Phormium 'Emerald Gem' offers a vibrant alternative that pairs beautifully with the softer lines of the mountain flax plant.

Mountain Flax Plant Care and Growing Tips

Growing the mountain flax plant is straightforward: - Plant in well-drained soil in a position that receives sun to part-shade - Water well during establishment—once established, these flaxes are drought tolerant - Prune away old or damaged leaves at the base to keep growth tidy and healthy - Watch for pests such as flax snails, but know that generally mountain flax plants are hardy and resistant

For those wanting to add texture, native beauty, and wildlife appeal to their gardens, the mountain flax plant is a dependable and rewarding choice. Explore our range of Phormium cookianum cultivars and related varieties like Phormium tenax to create your own resilient New Zealand-inspired landscape.


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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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