Yes. Unless it is really leggy, best to wait and do a pre-emptive cut in spring.. I have a little rule of thumb for lavenders (angustifolia) - 8/8/8 - prune 8inches on the 8th day of the 8th month. Obviously, you don't have to follow these timings precisely, but as a little reminder that lavender needs pruning as soon as the flowers fade, it is a handy mnemonic.