Lavandula ×ginginsii. Hardy, evergreen, perennial herb with lavender blue flowers. Woolly grey foliage on dense, compact plant. Prune back in early spring or late fall. Attracts butterflies. Good in herb gardens, borders, containers, and rock gardens. Grows 24-36" tall and wide. Full sun. Plant in light, well-drained soil. Zones 5-9.