Thanks all. That is what I thought. They are already yanked. and is dinner tonight.I had one flower in the whole scad of onion sets so not bad. The onions are fairly small since I never give them the room they deserve because my garden is only 20' x 16' and between trees..

A large basal bulb of walking onion (allium cepa proliferum) planted in fall around here will develop two or three strong shoots by spring. Left undivided, these will get to medium size, make a lot of topset bulbils and make medium size basal bulbs again by the next fall. A better way to manage them is to thin the shoots down to one by using them for green onions in the spring. Then you'll get a bigger main shoot, bigger topsets and a bigger basal bulb which can be used like a shallot in late summer and can be stored for a few months. Large topsets can be planted out in late summer to make small scallions by late fall or early spring. Small topsets in mid-summer can be pickled or used for cooking. I don't much experience with shallots, maybe someone else here is expert. As far as leeks, did you mean that you set out seedlings? I have never heard of 'sets' for leeks.

A few of mine have fallen over, but the leaves are still quite green. These are some of my red ones, the yellow onions are still standing tall, but have not seemed to bulb up yet. They were transplanted out on 4/15. Should I harvest the ones that have fallen over, or wait a bit longer until the leaves have turned brown?

Matt, not knowing where you live and what type of onion you planted makes it difficult to answer your question. There are long day onions for planting in the north and short day onions for planting in the south. If your onions are laying down, they are probably done bulbing and have started to seal off the top of the bulb. Don't water at this point. You want them to dry out. Layton and Mari--Onions do not usually flower unless it is a second season of growning for them. If they flower they are working on seed production and not bulbs. (That's why it is not a good idea to leave bulbs in the ground for next year.) Onions that bulb should be harvested and used shortly thereafter. Trying to keep those for storage will result in disappointment.