Phormium tenax Perennial. New Zealand flax is a vigorous growing plant with graceful sword like green leaves and bronze flower stems with orange flowers. Good for landscape use and as a feature plant. Grows to a height of 9ft (3m). (10 Seeds) £1.50 Quantity: at £1.50 each Add To Basket 0 in your basket View Basket Checkout Sowing Infomation: Keep seed refrigerated until use. Cover seed lightly with vermiculite and germinate at 20-25ºC. prick out when large enough to handle into 9cm pots.