Although spring bulbs usually mean a spring planting, it is possible to force bulbs at any time of the year indoors. Flowering bulbs during the winter adds color to an otherwise dull and dreary house. Forcing bulbs indoors also ensures the bulbs will grow properly outdoors when spring is late to arrive. It is essential that healthy, certified flower bulbs are used, and also using bulbs that are recommended for forcing, says Oregon State University.
Fill clay pots with commercial potting soil and place the bulbs into the soil with the "noses" of the bulbs sticking up. Do not bury the bulbs. Plant several bulbs in the same pot, keeping them close together. Do not press the bulbs into the soil, but gently work the soil around them.
Place the bulbs in the refrigerator once planted to cool the bulbs for 12 to 16 weeks. Keep the temperature between 35 and 50 degrees Fahrenheit. Cover the pot with a clear plastic bag with holes punched into it for ventilation.
Remove the pots from the refrigerator and place them in a warm spot, between 60 and 65 degrees Fahrenheit, with indirect sunlight.
Move the pot to a warmer place once the shoots appear and turn green. Rotate the pot regularly for even growth of the plant. When buds begin to show color, move the pot to a place with indirect sunlight to prolong the life of the flowers.