rennial for sun with clusters of tiny purple-blue flowers on tall rigid stems 
Continuously present in the top ten bestselling garden centre perennials.
This elegant, tall stemmed plant produces a profusion of tiny purple flowers growing in delicate individual clusters. This reliable variety also has good resistance to pests making it a failsafe addition to any border. 
Flowers June - late October Winner of The Royal Horticultural Society Award of Garden Merit,
 Ht. 1.5m+