Have they bloomed and you set them in the garage because they were done flowering? If so I would just add the spent bulbs to the compost pile as they rarely rebloom after being forced. If you bought them as bulbs not in flower yet then bring them indoors and into the light as soon as you see sprouts of new growth from the bulb tips. Hope you got to enjoy the wonderful fragrance of the blooms this past winter. Keep growing, Marianne Binetti