My focus is on US natives, but prefer Iowa natives, wanting to grow what was here historically, if possible.
After I left my comment, I tried delving into this. Other than the mention on the USDA site, I am not finding any concrete info on this plant, but about the C. terriflora causing great problems. (At least as far as I searched.) A New York site even gives the C. Virginiana as a suitable replacement for the Sweet Autumn Clematis.
