Tall spires of deep purple flowers rise straight up on sturdy stems, creating height and drama in containers or the back of a bed without needing staking. Blooms continuously from spring through fall if you keep spent flowers pinched off.

Give it sun and average soil, and water when the top inch feels dry. The vertical habit makes it a natural partner for lower-growing annuals, or use it solo in a large pot where it can reach its full impact.