Rosemary forms an evergreen hedge packed with fragrance. Blue flowers cover the plant in late winter to early spring, and needle-like leaves offer an aromatic perfume. Leaves can be used in cooking. Use rosemary in waterwise plantings, where its drought tolerant nature shines, or plant it as an informal hedge. Most rosemary plants, including ‘Tuscan Blue,’ are hardy in Zones 8-11, but you can find varieties like ‘Arp,’ ‘Madeline Hill’ and ‘Alcade Hardy’ that survive winters in Zone 6 and protected spots in Zone 5.