In Perennial All-Stars, Jeff Cox says, "Russian sage is one of the most useful and beautiful of the fillers for any perennial garden." It has aromatic, gray-green foliage with soft spikes of lavender-blue flowers from mid summer to fall.
Use Russian sage where you need something large. It looks terrific with ornamental grasses, echinacea, rudbeckia and daylilies. Cut the plants back to 10" in the spring to keep them bushy. Hardy in zones 4-9.
Sowing Perovskia Seeds:
Sow indoors in late winter. Barely cover the seeds, then refrigerate for 3 weeks. Full sun.