Perovskia atriplicifolia Russian Sage Size: 3 to 5' high and 2 to 4' wide. Hardiness: Zones 3 to 9. Heat Zones: 9 to 1. Habit: Produces clumps of attractive gray-white stems that arch outward at the base, then become upright toward the tips, creating a very neat "shrub" for the garden. Where the fuzzy gray-green leaves stop, the flowers begin. Culture: Full Sun.