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tenax flax

Tenax flax, known botanically as Phormium tenax and commonly as New Zealand Flax or Harakeke, is a striking native plant beloved by gardeners and landscapers throughout New Zealand. With its bold upright leaves, versatility, and cultural importance, tenax flax is an ideal choice for both home gardens and large-scale planting projects. Its resilience and unique beauty make it a standout feature in coastal, rural, and urban environments, providing both architectural structure and year-round interest.

Phormium tenax

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Phormium tenax, commonly known as the NZ flax or Harakeke, is a flax plant that produces erect, green, sword-like leaves. Stems rise above the foliage in summer to bear twisted-looking flowers that result in black seed pods in autumn, and the nectar produced by the flowers attracts both birds and butterflies. Harakeke grows as a clump to about 2 m tall and the same wide, performing best when planted in full sun on a well-drained site. It is a popular landscape option that is also often used to contrast with other plant colours. Mass planting on a bank not only provides an outstanding display but is also excellent for helping to stabilise the soil.

Phormium tenax plant in a garden with green foliage.
  • Suited to regions:
    All regions
  • Plant type:
    Flaxes
  • Height:
    2.00 m
  • Spread:
    2.00 m
  • Flowering time:
    Summer
  • Tolerances:
    Coastal, Extended dry periods, Hardy, Wet, Wind
  • Garden uses:
    Banks, Living areas, Parks, Ponds, Pool areas, Specimen
  • Garden styles:
    Architectural, Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Mediterranean, 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...

From$16.13
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...

From$16.13
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...

From$24.23
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...

From$18.23
Beschorneria yuccoides flax-like plant with blue-green leaves and large pink flowers.
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Beschorneria yuccoides

Beschorneria yuccoides (Mexican Lily) is an architectural evergreen valued for its sculptural rosettes of sword like foliage and tall coral toned...

From$29.63
A mass planting of Dianella caerulea 'Little Jess' plants with lush, green foliage.
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Dianella 'Little Jess'

Dianella 'Little Jess' is a variety of NZ Flax Lily that bears spikes carrying delicate, blue flowers in spring above lush, mid-green leaves. Small...

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Dianella Kentlyn

Dianella Kentlyn is a variety of the commonly known, Flax Lily, produces upright, strap-like leaves which are a rich, dark green with a blue...

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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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Large Astelia chathamica in a garden with silver flax-like leaves.
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Astelia chathamica (Chatham Island Astelia)

Astelia chathamica, commonly known as the Chatham Island Astelia or Kakaha, produces broad, erect, silver-green leaves. The leaves are held with a...

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Phormium tenax

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What Makes Tenax Flax Special?

Tenax flax is famed for its sword-shaped leaves, which can grow up to 2-3 metres tall. These leaves range in colour from rich green to bronze and create dramatic foliage accents. In late spring and summer, mature plants send up tall flower spikes that attract nectar-seeking birds, particularly tūī and bellbirds, bringing lively movement and sound to your garden.

As a native plant, Phormium tenax is deeply embedded in New Zealand's history, traditionally used by Māori for weaving mats, clothing, rope, and nets. Today, tenax flax remains a vital part of the landscape and biodiversity, supporting native wildlife while offering practical benefits such as erosion control and windbreaks.

Growing Tenax Flax in Your Garden

One of the greatest advantages of tenax flax is its adaptability. It thrives in a wide variety of soil types and easily tolerates harsh coastal winds, salt spray, and even occasional flooding. Tenax flax prefers full sun to part shade and needs only occasional watering once established, making it a perfect low-maintenance choice for sustainability-minded gardeners.

To get the most out of your planting, consider grouping tenax flax with smaller or contrasting varieties. Pairing with cultivars such as Phormium 'Emerald Gem' or Phormium 'Surfer' adds texture and colour variation, while combining with robust species like Beschorneria yuccoides in mixed borders creates dynamic year-round visual interest.

Landscaping and Design Uses

Tenax flax can be used in a variety of landscaping situations. Mass plantings of tenax flax form dramatic screens or hedges, while single specimens can act as striking focal points in contemporary garden design. For a more colourful or compact display, try blending tenax flax with related varieties such as Phormium 'Evening Glow', Phormium 'Jester', or Phormium 'Chocomint'. For smaller spaces or container planting, explore options like Phormium 'Green Dwarf'.

Tenax flax also thrives in wetland restoration and natural garden settings, where its dense roots help stabilise soil and protect against erosion. Combining tenax flax with moisture-loving plants like Phormium cookianum or Dianella tasmanica variegata can create flowing, layered plantings that mimic natural wetlands.

Choosing Your Perfect Flax

Whether you’re after the bold stature of tenax flax or the unique tones of cultivars like Phormium 'Coffee', there’s a New Zealand flax for every garden. Explore our wide selection to find both traditional and new varieties that suit your style and site conditions. With its resilience, striking look, and ecological value, tenax flax remains one of New Zealand’s top choices for sustainable, beautiful 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.

Start your garden with Gardenia Veitchii and Buxus sempervirens (Boxwood), and add depth with lesser-known gems like Robinia Lace Lady, Parrotia persica, and Lomandra Misty Green.
–The Plant Company

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