posted 3 years ago
In my limited experience, here’s my 2 cents…..
…Once the tops have flopped over, the bulb doesn’t get bigger.
…If you live in a low humidity climate, the tops will die back and dry up. Regretfully I live in a very high humidity area, so I risk rot if I try to dry back the tops naturally. I’ve tried letting the tops dry up but ended up losing 20% of the onions due to neck rot. BUT I can only grow short day bulbing onions where I am, so things may be different for the long day, storage type onions.
It's never too late to start! I retired to homestead on the slopes of Mauna Loa, an active volcano. I relate snippets of my endeavor on my blog : www.kaufarmer.blogspot.com