Phormium Cookianum Hookeri 'Tricolor' Mountain Flax 3Ltr PotPhormium cookianum subsp. hookeri 'Tricolour' is an eye catching variety of mountain flax, celebrated for its striking variegated foliage. This hardy perennial forms a large clump of sword shaped leaves that showcase a unique blend of mid green and bright cream stripes, with each leaf's edge adorned by a vivid streak of red. In the summer, established plants may produce large panicles of yellowish green flowers, adding a vibrant touch to the garden.