Daffodils, narcissi, crocus, muscari and other bulbs look great in groups of three, five, or more. Hyacinths look quite handsome when planted singly, or in groups. Dense plantings are recommended for minor bulbs. After planting, place the pots in a cool, dark place, such as a cellar or refrigerator, to initiate root and shoot growth. Other suitable environments include an insulated cold frame, under a porch, or an unheated garage.
Cold storage is a critical step in the forcing process.
Ideally, temperatures should be 35-48 degrees Fahrenheit. If necessary, set boxes, pots or black garbage bags over your potted bulbs to keep them dark during the cooling period. The medium should be kept moist through the rooting and cooling period. After five or six weeks, the roots should emerge out of the bottom of the containers of the large hardy bulbs. Longer cold storage will result in taller flowers, while storage time shorter than 13 weeks will result in smaller plants and sometimes aborted flowers.