French lavender produces a very delicate and beautiful blossom during the warmer months of the year. It likes sandy soils with a pH of 7.0 for optimum growth and beauty. Annually, it's important to prune French lavender to extend the life of the plant and encourage blooms for next year.
Pinch off dead blooms throughout the growing season of the French lavender. This will encourage new growth.
Examine the French lavender weekly and prune any dead limbs. Hold your pruning shears at a 45-degree angle. Cut the dead branch off at the base, flush to the plant.
Prune approximately 1/4 of the lower branches at the base of the lavender plant the first time you prune. The following year, prune approximately 1/3 of the lower branches at the base.
Prune 1 to 2 inches from the tips of the branches beginning in the third year of the plant's growth.