Hazel,I cut my Bee-Balm right down to the ground in the fall, so I am sure it will be ok.
Know nothing of Milkweed or the other thing you mentioned.
I would love some Milkweed for the Butterflies though.
"The cruelest animal is the Human animal"
3 kitties,Rocky(r.i.p my boy),Chico,Vinnie