This section is from the book "The Florists' Manual", by William Scott. Also available from Amazon: The Florist's Manual.
Under this head, instead of under their respective names, is given the culture of those bulbs that are generally forced, especially those known as Dutch bulbs and which have been so important an item with us for the past twenty years.
Roots that are often called bulbs are really corms and not bulbs. The crocus, caladium, richardia and gladiolus are corms. The true bulbs are the lily, hyacinth, tulip, etc. It is only of the Dutch bulbs that this article treats.
The tulip, hyacinth and narcissus all want about the same treatment, with some variation, which will be noted. There is little doubt that the lilies (or what may be called the loose-scaled bulbs) are subject to injury through being long exposed to the air, and they really should not be long in a perfectly dormant state. Notice the Lilium can-didum in our gardens. Soon after the flower stalk is gone the plant begins to throw up a young crop of leaves, showing it is but a short time dormant, if at all. Not so with the more fleshy bulbs, like tulips, which remain out of the ground four or five months without the slightest harm.