Blue Vervain is a tall native perennial with narrow spikes of tiny blue-purple flowers arranged along upright branching stems. It naturally grows in wet meadows, marshes, stream edges, ditches, and other moist open areas. It prefers consistently moist soil but can tolerate average conditions once established. Easy to manage in a naturalized planting. It can be divided in spring and performs poorly in very dry soil. It may require staking in rich garden soil.