Rosemarinus officinalis. Tender perennial herb. Aromatic, needlelike, evergreen foliage. Dark blue flowers in spring. Good in borders, rock gardens, and containers. Grows 4-6' tall by 2-4' wide. Full sun. Tolerates hot sun. Plant in loose, well-drained soil; dislikes heavy clay. Zones 8-10. Can be wintered indoors in colder areas.