I've been asked by one of the staff librarians at the New York Botanical Garden's Library why some bulbs flower in the spring and others bloom in the fall. (I didn't bother to point out to her that there's a third subset of summer-blooming bulbs.) I'm not sure what the answer is. Does anyone have good information as to why bulbs bloom when they do? Judy in New Jersey where the previous deluge has given way to days of clouds and sun. Dracunculus vulgaris is in bloom. Now that's a funky one!