We have quite a large established bed of Jersey lilies which are in full bloom at the moment. Unfortunately we are about to embark on an extension and need to move the flowerbed (starting on-site in 6-8 weeks approx). Construction will take around 12 months.Can we lift the bulbs (clean them off etc) and store in a cool shed for the next year or do we need to transplant? Most grateful for your advice as we would hate to lose the bulbs.