I have found that onions really like a nice mulch of pine bark fines. They keep the soil nice and moist and don't hinder the onions growth. I try to mulch mine within a week of setting them out and after I pull them in the early summer I just till in the mulch before planting something else.
I really need short day types also and have found that besides Vidalia types that white Bermudas do the very best. They are not nearly as large as Vidalias but they keep so much better and they taste nearly as good.
Bill
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