Lavandula angustifolia The classic multi-purpose herb! Not only are the plants a lovely ornamental, you can use the dried flowers for arrangements, in aromatherapy applications, as a bug repellent, for culinary uses, and to make a potent essential oil. The plants grow to 12-20" tall and sport spikes of bluish-purple flowers. Seeds must be stratified before planting. Perennial in zones 5-9.