New Zealand flax
Phormium tenax · Asphodelaceae
📷 Kahuroa · Public domain
⚠️ Feuilles contiennent composés irritants. Contact/ingestion : irritation cutanée et buccale chez chiens/chats/enfants; danger léger.
The gardener's calendar
Ideal time to plant new zealand flax: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen, lanceolate, dark green to reddish-brown depending on varieties
- Flowering
- June to July, tubular yellow-orange flowers in upright panicles
- Mature size
- Height: 120–150 cm; width: 80–120 cm
- Growth
- Fast to moderate
- Hardiness
- Zones 8–11 (tolerates down to approximately −5 °C)
- Origin
- New Zealand
- Soil type
- Well-drained, tolerates poor to moderately fertile soil
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Phormium tenax demands impeccable drainage and well-draining soil. In cold regions, protect the base in winter with thick mulch (30 cm); the heart is more fragile than it looks.
The common mistake
Planting in heavy or poorly drained soil: even without visible excess water, chronic moisture rots the crown in winter.
The pro's trick
Divide the clump every 5-6 years (April-May): rejuvenates the plant, creates vigorous new plants, and restores foliage density in the center.
Care
Exposure
Phormium thrives in full sun for better coloration and a compact shape. It tolerates partial shade but will be less dense and less colorful. Position it in a bright location, ideally facing south or west, sheltered from strong winds that could damage the leaves.
Watering
Water moderately, especially during growth (spring-summer). Once established, phormium tolerates relative drought. In containers, allow to dry slightly between waterings. In winter, reduce watering.
Soil and drainage
Well-drained soil is essential to prevent root rot. Mix potting soil with sand or gravel. Phormium accepts poor and chalky soils. In pots, use a light, aerated substrate with a good drainage layer at the bottom.
Fertilizing
Apply balanced fertilizer in spring and early summer to support growth. Moderate feeding is sufficient; this plant is not demanding. Reduce or stop fertilizing in autumn-winter.
Pruning and cleaning
Regularly remove dead, damaged, or browned leaves at the base to maintain appearance. Cut off faded flower clusters after flowering. No drastic pruning needed; phormium naturally maintains an elegant shape.
Diseases and pests
Few major problems in optimal conditions. Watch for root rot if there is excess moisture. Aphids or spider mites may occasionally appear indoors or in very hot climates. Ensure good air circulation and foliage hygiene to prevent issues.
Did you know?
Phormium tenax, called 'Harakeke' in Māori, provided Polynesian peoples with strong fibers for centuries to make clothing, cordage, and sails. European settlers exported this plant in the 19th century to industrially exploit its fibers, before textile production declined with modernization.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
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- Cerulean flaxlilyDianella caerulea
- Tasmanian flax-lilyDianella tasmanica
- Tree aloeAloe arborescens
- Lemon daylilyHemerocallis lilioasphodelus
- King's-spearAsphodeline lutea
Tips generated and checked by Viridia — adapt them to your local climate.