We have a ton of milkweed on our land. Our yard actually looks "funny" because we've made a point to mow around it so we have random unmowed spots all over. As much as I hate to say it, I think next spring (or maybe at our last mow of this year in the fall) we will probably take most of those random spots down, but this is only on the 1 acre or so that we do mow, there is still a TON of milkweed in the remaining 4 acres we have that we don't mow. We have monarchs every day and I still see the monarch caterpillars.