Lavandula ×intermedia. Evergreen perennial herb with fragrant blue flowers on 3-4' stems. Developed in France for the perfume industry. Prune back in early spring or late fall. Attracts butterflies. Good in herb gardens, borders, containers, and rock gardens. Grows 18-24" tall and wide. Blooms in spring and summer. Full sun. Plant in light, well-drained soil. Zones 5-9.