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A compact, mound-forming perennial with generally upright stems. The bulk of the lavender-blue bloom spikes appear at stem ends in early spring, but judicious dead-heading will encourage small bursts of bloom through summer. The oblong, toothed leaves of bright green are an invigorating contrast to the bright blooms. From Europe and Eastern Asia.
Mature size: 2-3 ft T x 1-3 ft W
Minimum temperature: -30° F