Sturdy, upright clumps to 1.5 metres with leaves arranged in clusters of 3-6 at intervals up the stems. A single erect flower stem of pale lavender flowers is followed by secondary spikes that prolong the display.
Associates really well with grasses in prairie style plantings or in a mixed border and has attractive seedheads if left to stand through the winter - just cut back old growth in spring.
Likes open sunny position on a retentive, well drained soil