Lavandula angustifolia. Perennial herb. Fragrant, fine cut, silvery green foliage. Spikes of fragrant purple flowers bloom in summer. Prune back in early spring or late fall. Attracts butterflies. Good in herb gardens, borders, containers, and rock gardens. Grows 18-24" tall. Full sun. Plant in light, well-drained soil. Zones 5-9.