Last year to add to my butterfly attracting plants, I bought four Swamp Milkweed
Asclepias incarnata 'Cinderella' The goal is/was to bring in the Monarch butterfly, which they did. I even had them laying eggs on the plant, which happened too late in the year to get any offspring. The problem I found with this plant is aphids love it to no end. So my question is; Is there some way to treat this plant for them not to love it so much, and still not harm the butterflies? I use no harmful chemicals in my yard at all, and would love to keep it that way.