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New Zealand flax

Phormium tenax

Also called New Zealand Hemp, Harakeke, Lowland Flax, Swamp Flax

New Zealand flax
Photo: Kahuroa, Public domain

New Zealand flax is an evergreen clumping perennial from New Zealand and Norfolk Island, grown for its sword-like leaves and tall flower spikes. It tolerates a wide range of conditions, and its main needs are full sun, room to spread, and moist soil.

Family
Asphodelaceae (Aloe family)
Grows as
Perennial
Light
Full sun, Part shade
Water
Water regularly while establishing, then keep soil moist; it tolerates short dry spells once mature.
Soil
Moist, fertile, well-drained loam; tolerates wet or heavy ground.
Temperature
10–30 °C; hardy to about -5 °C, protect from hard frost in colder areas.
How easy
Easy
Safety
Toxic
Native range
Norfolk I., New Zealand
Climate
temperate

About

Phormium tenax (called flax in New Zealand English; harakeke in Māori; New Zealand flax outside New Zealand; and New Zealand hemp in historical nautical contexts) is an evergreen perennial plant native to New Zealand and Norfolk Island that is an important fibre plant and a popular ornamental plant. The plant grows as a clump of long, straplike leaves, up to two metres long, from which arises a much taller flowering shoot, with dramatic yellow or red flowers.

Despite being commonly known as 'flax', harakeke is of the genus Phormium, a monocot, and is a leaf fibre, whereas flax (linen) is of the genus Linum, a rosid, and is a bast fibre (which comes from the stem of the plant). The two plants have an extremely distant evolutionary relationship with each other.

How to grow it

Phormium tenax had many uses in traditional Māori society. It was the main material used for weaving, adopted after aute (paper mulberry), the traditional tree used to create fabric in Polynesia, did not thrive in New Zealand's climate. Many of the traditional uses have largely fallen into disuse, though there is an upswing in the use of traditional materials in modern Māori art and craft. The two most common forms for flax in traditional craft are the use of stripped, dried leaves as broad bands, such as in the weaving of kete (flax baskets), and the scraping, pounding, and washing of the leaves to create a fibre — muka — which is used in tāniko (weaving) of soft, durable fabric for clothing. Flax is also used as a decorative and structural element in tukutuku, panelling found within Māori wharenui (meeting houses).

Prior to the Great Depression of the 1930s, which decimated flax as an industry, there were two serious attempts by Europeans to breed for fibre. The first was by Wellington-based Leonard Cockayne about 1908.

Where it grows

The jumping spider Trite planiceps lives predominantly in the rolled-up leaves of this species. Phormium tenax is a coastal cover plant associated with significant habitat such as the breeding habitat for the endangered yellow-eyed penguin.

Other Phormium plants

Phormium colensoi · New Zealand Flaxes

Text excerpted from the Wikipedia article Phormium tenax by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

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