five things....Daffs need to be buried deeply to flower and naturally work their way up out of the soil. Mulch every year to keep them covered. Once they have flowered, dead head them and feed them as you would any other flowering plant. Leave the leaves alone, let them die down naturally. They also need a period of natural dormancy which the last winter may not have allowed them. Eventually the bulbs will fail to produce but will produce new bulbs which will, for a few years produce only leaves.