Linum lewisii. This drought tolerant perennial forms clumps of tall, slender stems with narrow, inconspicuous leaves. The plants are crowned with clusters of lovely, pale blue, cup-shaped flowers. Use Lewis Flax in xeriscaping schemes or in larger containers – it is hardy and durable. Plants grow to around 90cm (36″) tall and bloom from mid to late summer. The stems make an interesting and airy touch to flower arrangements. This plant is often used for erosion control and its seed capsules are attractive to wild birds. All flax varieties can become established in the right conditions by spreading their seeds. However, they do not spread by rhizomes and are not considered noxious or weedy.