Kelly's onions are way superior to anything else. He's got true seeds so you can develop your own. Those originally from seed are more inclined to flower. You can farther tweet them, or cross them with your favorite regular onion.
In fact, many normal onions are perennial. We just don't wait that long nor select for the trait. The biggest difference is in how much they divide after flowering, or even before as those that divide are usually culled.
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