A generous blossoming in big blue spikes at the end of the summer, liked by bees.
Easy to prune after frosts. Perfect shrub for summer sales.
Deciduous shrub producing strong blue flowers (darker than those of the species) from august until september. Tubular flowers forming fragrant panicles and attractive grey green leaves with 5 to 7 lobes. Good resistance to winter cold on drained soil, but quite sensitive to late spring frosts.