Perovskia 'Blue Spire' (9cm)

Russian Sage. Handsome upright sub-shrub with deeply cut aromatic silver-grey leaves and large spikes of violet-blue flowers from August to September. Fantastic addition to a herbaceous border or gravel garden. Magnet for pollinating insects. Height 1.2m. Spread 1m. Full Sun. Well-drained soil. RHS Award of Garden Merit.