I haven't crossed any intentionally yet. I had planned to this season but things got so busy with preparing for a fair, going away for a week and my dog/companion having to get put down. Hopefully next year but in the meantime I've let the pollinators do the work. Just transplanted 50 of this years babies. (another 50 waiting in the wings. Even if I don't select any to propagate I use them to stuff in cracks in my stone walls or fill stone containers that I create. Growing from seed is a win, win situation.