I have had a happy, healthy common milkweed planted in a giant pot right next to my swamp milkweed for about five years now. It has never had an egg laid on it. I have only had two eggs laid on my A.tuberosa plant. In my yard the monarch's prefer swamp milkweed.
I am planting some new varieties this year (purple, showy, poke, tall green, and spider). Not sure how well they will do in my yard, but I will be interested to see if any of these new varietes rival the swamp milkweed.
Western New York