There appears to be a big debate on interwebs about this: when should one prune back Lantanas? I've always heard you wait until the end of winter or early spring to prune off the dead wood. Others have said once they are dead, as mine are after the first early freeze, you can prune back in "winter" (Central Texas so our "winter" can be in the 70s to freezing depending on the day. Haha.) Lastly, some people say prune (for shaping) while in bloom in the summer. They look shitty all dead and brown even though I know, if other years are correct, they will come back in spring once it warms up. Maybe it makes no difference? Idk.