Rosemary (Rosmarinus officinalis) is a culinary herb used for flavoring or garnishes that grows as an annual in most locations. Rosemary is a woody evergreen shrub that often reaches more than 6 feet tall in U.S. Department of Agriculture hardiness zones 8 through 10. Gardeners who live outside this region can start rosemary from seeds inside during the winter and transplant outside when the warm spring weather arrives.