Verbena is also commonly known as vervain. It is a biennial plant that easily self-seeds, which means it often returns as a perennial in the garden. It is a tall plant that spreads naturally among other plants, making it especially suitable for natural-style gardens. Verbena combines beautifully with tall ornamental grasses, tobacco plants, Crocosmia, Echinacea, and Japanese anemones. Protect the plant from frost in winter by applying a layer of mulch. Verbena flowers from June through September.