I kept mine in a pot in a greenhouse over winter, it's not much different here than in London although the city causes micro climates. Under cover they survived well but continued hard frost is not good for bulbs in pots even though it was a fairly big pot, they freeze through. I'm not sure it would have thrived in the ground either as our climate is often cold in spring and summer so a greenhouse gives it a boost with extra warmth. It might have survived in the ground but unless it could replenish itself it would have starved and died anyway. Your springs and summers are probably warmer than ours so you might be successful.