Does anyone have any advice on starting the bare root perennials that start to come out in the stores at this time of the year. They look like a good deal when you look at the price, but I can't plant them out for weeks yet. My last frost date is usually around the first week of June and I don't like to leave them in the bags too long after buying them, but they are grown out too much by the time I can plant them out. I have a greenhouse and was thinking about potting some up and sinking the pots into the beds in the greenhouse until I can get them moved outside. The only thing that I can forsee as a problem is the temperature fluctuations. Daytime can get up to about 25c and night time can get down to -5c. Would this present a problem to bare root perennials potted and sunk into the beds in the greenhouse? Any other suggestions?