Phormium cookianum (Mountain Flax / New Zealand Flax) is a smaller, more compact relative of Harakeke, valued for its graceful foliage, coastal tolerance, and striking form. It’s ideal for adding architectural interest to gardens, particularly in rockeries, borders, and coastal landscapes.
 
Description
Evergreen clump-forming flax with narrow, arching, sword-shaped leaves
Leaves are green to bronze, sometimes with reddish tones, often smaller and more refined than Phormium tenax
Produces tall flower spikes with nectar-rich tubular flowers in summer
Typically grows 1–2 metres high and wide, depending on variety
Hardy, long-lived, and low-maintenance
 
Growing Conditions
Thrives in full sun to partial shade
Prefers well-drained soil, tolerates poor and coastal soils
Moderate watering; drought-tolerant once established
Hardy to wind, frost, and salt spray
Low maintenance; remove old leaves and flower stalks if needed
 
Uses in Landscaping
Ideal for rockeries, coastal gardens, and native landscapes
Excellent as a feature plant, border, or specimen clump
Provides nectar for native birds and insects
Suitable for public parks, restoration projects, and residential gardens
Works well in mass plantings or layered with other native plants for texture and color