Perovskia atriplicifolia. Grey green leaves form an upright bush and are fragrant when rubbed. Spikes of smoky, lavender blue flowers are good for cutting. 1995 Perennial Plant of the Year. Good in mass plantings and borders. Grows 3-4' tall by 2-3' wide. Blooms from July until September. Full sun. Plant in well-drained soil. Zones 4-9.