I have grown onions for years. Last year and now this year too, I bought sets at the store instead of starting from seed inside (cats eat the seedlings). Last year the yellow ones were awesome but the red ones all got flower stalks that greatly reduced the size of the bulb! The garden center had not had anyone else complain of it. This year some of the red ones are doing it again. I am keeping them trimmed off as much as possible. I would like to know why this happens and what is the best way to get nice big red onions as well as the yellow.

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