If you can cut the tops off with out letting the spores out it will not come back next year. Milkweed is great for the butterflies and I hate to get ride if it but it takes over. I must make sure that I cut the tops off and do not let the seed pods open. I have done that and given the seed pods to friends who have planted them around their property for the butterflies.
If you can keep them from going to seed you will be much better off. I had a huge problem several years ago and just cut them down before they developed a seed pod and have only a few here and there now. As the birds bring in the seeds.
-I'm so busy... I don't know if I found a rope or lost my horse.
-An Armed Man is a Citizen an unarmed man is a subject.
-Where ever free speech is stifled Tyranny will reign.