Sorry to be a late responder. I've been off-line for a few days. Try them, you might like them. I would put them with something you already dump leaves or mulch over for winter protection, but otherwise you are are coldest experimenter that I know of! OOps, I mean the experimenter with the coldest climate... Are you still collecting penstemon seeds for folks? I have three small bushes of P. angustifolius which are covered with seeds. I don't think there was a chance of cross pollination because they bloomed much earlier than the others nearby. Are there any bulbs you do grow with Penstemons? Marguerite: Always seeking articles or tidbits for next issue of 'The Bulb Garden'