To add my two cents worth--I have been growing prolifs for four years here. The first year, my experiment was to plant some outside and some kept inside in a window for the winter. The ones outside all died while the ones inside were thriving, planted out in the spring and are now blooming plants. Now, the prolifs I want to keep are put in water to grow the roots, then potted up and grown on in the south window. Sometimes I need to pot on mid winter as roots grow out the bottom but not often.
Edited to add--I forgot to mention that I usually have poor snow cover with half a dozen freeze/thaw cycles a winter. These are murder on several cultivars.
