Onions & Haircuts

After my onion seedlings came up, and while they were still in flats, I gave them haircuts to stimulate bulb growth. Now that they're in the gaden, shouldn't I be doing the same thing? I don't see any reason I can't clip them to about 4 or 5 inches and let all that energy go into bulb formation.
Any thoughts?
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What energy? It is the tops that convert sunlight into energy. Plants don't do well if you remove too many of their leaves.
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