I have one of those 72-cell self-watering seed starting trays, and the cells are pretty small, maybe 1" wide by 3" deep. And I thought this would be perfect to start onions. Is it?
My question is, how long can the seedlings stay in there before they have to be transplanted?
I guess the important question is when does the bulb start form? Cuz there won't be any room in this tray.