Verbena bonariensis Seeds
Rose-violet flowers bloom all summer to frost giving long-lasting color to the garden. Looks great massed to form a sea of blooms dancing with butterflies or when allowed to mingle with other perennials and shrubs. If left unpruned, the long stems sway in the breeze for a very nice see-through effect. Cut back, and purpletop will take on a compact, shrub-like appearance.
Full sun. Height 3-4′. Spread 1.5-3′. Reseeds in favorable conditions. Deadhead or allow for new seedlings. Zones 7-11. I personally like the way it scatters here and there about the garden.