In warm, dry climates, the herb’s 39 evergreen species can fill problem spots in the garden with year-round foliage and with flowers in lovely shades of purple, blue, violet, and gray. Lavender is the secret weapon of gardeners around the world.Give lavender full sun and from 2 to 3 square feet of space to spread. Plant lavender in well-drained soil (add organic matter to improve heavy soils). Water plants deeply but infrequently, when the soil is almost dry. Prune in early spring or at harvest time. For low-growing varieties, trim back foliage 1 to 2 inches. Need more inspiration? Look at the adorable lavender gardens from all over the world, and I’m sure that you’ll want to plant some in your own outdoor space.