Might want to contact Rose Franklin; I bought some plants from her, very helpful. But hurry; she is planning to retire soon. She lives and breathes Monarch's and Milkweed. Would have liked to visit her farm located in PA. Some Milkweed is poisonous, no idea what would eat it.As far as I know, not one of the ones I planted survived. They grow very well in this garden, which is fenced in, so I think something is eating up all the small plants I planted elsewhere.
That is a Bald face Hornet nest. just got stung by a couple last summer.Not nearly as bad as they look but would hate to get hit with a whole nest of them