[header] How to harvest lavender [title] Prune and harvest when the flowers bloom. [step] Pruning and harvesting lavender are essentially the same-you're removing the flowering stalks from the bush. This promotes new growth in the plant's roots, keeps the plant looking neat, and leaves you with 1-8 bunches of fresh lavender flowers. 
Lavender should be cut when the flower have just opened in spring. This is the time during which they're most fragrant and beautiful.