Blue flax is a short-lived perennial native to a huge swathe of North America.
Quite ephemeral in appearance with blue-green slender leaves and shimmering sky blue flowers borne on long wiry stems.
It blooms from late spring to mid-summer but the flowers only truly open on sunny days.
Very decorative rounded seed-heads form in late summer.
It grows on ridges and dry slopes, from sea level in Alaska, up to 3,400m in the Sierra Nevada so it's a tough little plant adapted to harsh environments.
Dry, poor soil will do.
Photo: Photo by and (c)2008 Derek Ramsey (Ram-Man). Chanticleer Garden, from Wikimedia Commons
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Well drained, poor