Prune - More woody herbs such as sage or thyme may require some actual pruning. Look for dead branches and cut them away and give winter savory, thyme and lavender (if not already done from summer harvesting) a short haircut to be ready for winter hibernation. Unless your rosemary is overgrown or a very large bush, it is best to just leave it be. Prune it as you use it throughout the summer and fall. When things are looking pretty good, a good dose of organic fertilizer will have your herbs ready for spring growth.