Butterfly garden perennials
What perennials would be good for a butterfly garden here in NW MN? I know they like Salvia and Agastachie, but they aren't hardy here, and buying the plants every year is costly.
I have been trying to get Asclepias tuberosa, var. Clay to grow for a couple years now. I think I need to invest in plants, the seed never germinates for me. And I have tried it a couple different ways. (I know it needs cold stratification).
I think I need to add a few plants here and there as the budget allows.