Peace Valley Lavender Farm generously shared these tips for Growing, Pruning and Drying Lavender. Visit their website for lovely lavender products including their own steam distilled essential oil!
Lavenders want well drained soil, good air circulation, and as much sun as possible to promote flower production. Lavenders prefer neutral to alkaline soil. In humid climates, coarse sand worked-in around the crown will help the plant dry out. Keep weeds down to prevent sources of wetness and avoid wetting the lower leaves, which may encourage disease. Lavenders require no feeding, though an occasional dressing of low-nitrogen organic fertilizer will make your plants happy. If you are growing lavenders in containers, a spring feeding of a slow-release fertilizer will be helpful. Also, lavender in containers will dry out faster than in the ground, so keep an eye on them.