And now that we are moving into late summer, August is the perfect month to prune lavender. Adam Kirtland, a gardener who shares his insight on Instagram @viewfromthepottingbench, explains how you should prune lavender and the common pruning mistake you need to avoid. But don’t worry, although August 8 has passed, you’ve still got time to prune your lavender. So, how do you prune lavender and what do you need to avoid? But that’s not all; once you’ve pruned your lavender, Kirtland suggests it makes perfect cutting material, or can be placed in a dark place and dried for later use in gifts and even baking.