I have never let mine sit in pots for that long. I force them and the let the tops grow and put them in the garden in late May after all chance of frost has passed so they can make a lot of energy for the next spring. This seems to work for me. If they are already in potting medium I would not uproot them. If you wanted to make them break winter dormancy I would just soak the pots bulb and all. Then treat them like a living plant until they begin to grow.
