Instead of a low-growing perennial hedge

Plant: Rosemary to spice up pastas and roasts.

How to grow: Plant these perennials in spring or fall in well-draining soil. Prostrate varieties like ‘Huntington Carpet’ and ‘Irene’ top out at 1 1/2 feet tall; upright ones including ‘Blue Spires’ and ‘Gorizia’ are hardier and can reach 4 to 6 feet. Zones 4–24, H1, H2.