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Show/giant onions splitting

Morning everyone, Every August bank holiday we have a village show and a number of villagers compete for the biggest onion (😳) This year, my dear old dad has grown some absolute corkers but with only about a month to go til the show, he has just rung to inform me that they are beginning to split ..... I’ve tried googling it but can’t find cause or remedy - if indeed there is one. I’m guessing it’s weather related?
Any onion growers out there who can offer some advice on what can be causing it and if there’s anything we can do to prevent it.
Thanks in advance 👍🏻
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I would harvest and dry them off now.
Don't know whether that means they will be ineligible for the show ... it depends on the rules.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.