Some bulb suppliers do not recommend this, in part because the freezing/thawing cycles are brutal to the bulbs. If you want to try it, be sure that there is excellent drainage over winter to prevent rotting. You might try placing straw bales around the bed and a thick layer of mulch over the bed to help insulate. Remove the mulch and bales in spring. You may also want to place wire mesh around the bulbs to prevent rodent damage. Good luck!
Some bulb suppliers do not recommend this, in part because the freezing/thawing cycles are brutal to the bulbs. If you want to try it, be sure that there is excellent drainage over winter to prevent rotting. You might try placing straw bales around the bed and a thick layer of mulch over the bed to help insulate. Remove the mulch and bales in spring. You may also want to place wire mesh around the bulbs to prevent rodent damage. Good luck!