Verbena, Blue VervainBlue Vervain is a native herbaceous perennial with a stiff, upright habit and hairy stems sporting sharply toothed lance like leaves. The thin flower spikes packed tiny purple blue flowers at the top bloom from mid summer into fall, attracting butterflies. Grows best with full sun and medium to wet well drained soils. Type: Perennial Origins: North America; GA Native Height: 2' 5' Spread: 1 2. 5' Spacing: 2' USDA Hardiness Zone: 3 8 Culture: Full Sun