Well, our native daffs, common around the Newent area of Glos., stay in the ground year after year. Pre-WW2, train excursions were organised from Brum so that folk could pick the flowers. Anyone who has travelled the M50 in March will have noticed these native daffs on both the verge and the central reservation. This emphasizes my point above - wait until the leaves yellow before lifting (if you must) Similarly, if one has them in a lawn, mow round them until July, and DON'T tie the leaves in knots!! The leaves must be left to get on with making food which is stored in the new bulb, formed at the base of the leaves.