Dense clump with strong upright stems, long toothed matt green foliage. Dainty spikes of of azure blue flowers, July to September. Sun or semi shade. 75cm tall. Loved by butterflies and bees. Any decent soil. Cut down in autumn and divide every few years.
Spring
Summer
Autumn
Winter
Evergreen
Acid
Neutral
Alkaline
Full Light
Dappled Light
Partial Shade
Part Day Shade
Full Shade
Plant awarded RHS AGM