Salvia yangii 

Salvia yangii, previously known as Perovskia atriplicifolia, commonly called Russian sage, is a woody-based perennial of the mint family that typically grows 2-4' 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. They had a long summer bloom and won the Perennial Plant Association Plant (1995).

They grow best, on average, in dry to medium, well-drained soils in full sun. Sharp soil drainage is essential, and wet, poorly drained soils should be avoided. Plants have good drought tolerance; the best flowering occurs in full-sun locations. Stems are more likely to flop if plants are grown in part shade. Cut back plants almost to the ground in late winter to early spring as soon as new growth appears.