Question: My onions are flowering. Doesn’t that ruin the bulbs? Why do they do that?
Answer: Yes. Harvest and use those onions immediately. They won’t store well at all. If anything interrupts an onion’s growth patterns, it is likely to bolt prematurely to flower. Sudden turns to hot, dry weather can trigger it. When you plant the transplants in late winter, you even need to sort out the larger ones, since they’re more likely to flower prematurely.