Sage, Russian

Perovskia atriplicifolia

A woody-based perennial of the mint family which typically grows 2-4′ (less frequently to 5′) tall and features finely-dissected, aromatic (when crushed), gray-green leaves on stiff, upright, square stems and whorls of two-lipped, tubular, light blue flowers tiered in branched, terminal panicles (12-15″ high).
Long summer bloom period.
Perennial Plant Association Plant of the Year (1995).