Posted: 09/09/2012 at 08:38
Chris. I keep mine outside all winter till spring. To protect them from the worst of the weather, they're kept in a sheltered spot. Last year some were brought into the GH early spring and potted up in fresh compost, the idea was to force them for an earlier show of flowers. It seemed to work, I had a longer show of flowers and was also able to discard those which didn't grow as well.
Alternatively, if you leave them in their pots, after a couple of years the bulbs start to multiply, bulk out and you get lots of tiny bulblets being pushed up to the surface.