How to Prune Lavender - never prune in fall or winter and never cut back to the ground. Prune in spring and early summer after first leaf buds emerge to cut out dead wood and then prune again just after flowers fade - deadhead and shape plants then, leave at least 3 - 5 leaf nods below each flower spike, when shaping, leave at least 5 obvious nodes above the ground where new growth can emerge
Pruning is probably one of the most confusing topics for new gardeners because there is no single method or timing that suits all situations. But, there are some basic underlying principles that, once you know them, can make it much easier to know whether to snip and clip or leave things alone. This post walks you through a pruning and deadheading calendar which you can adapt for the plants in your garden.