If you'd trawled through the questions on here in the last couple of months, you'd have found endless queries on this subject. Check the trunks for signs of rot, with or without oozing - if none, leave it alone and wait - it may shoot new growth anywhere up the trunks, or from the base, or both, and when it does, cut back to that point. If there's serious rotting, especially with orange gunk coming out, you'll need to cut down past that point now. You may have to wait till late June before seeing any new growth. In the meantime, suggest you remove the spent flowerstems.