I've always grown my onions from purchased sets. I do it because I know they professionally grown and they should be fairly disease free and specific to the type I want to grow.
I have always wanted to grow the walking onions in a bed away from all other allums and not be concerned about cross pollination. One reason I haven't is the fact that I have have a lot of wild onions on my property and I'm not sure if they would cross with the walking onions.
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