The very large tomato thread

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The biggest I grew was a heart (no fused blossom) at 2.2 lbs, years ago. It was the only fruit on a very scrawny plant, not sure how it ended so big.
I do (or at least did) have a determinate big cherry type produce a mutation which produces only fused blooms. Those seeds are now more than 10 years old and not sure how they would germinate. Would have been interesting to cross it with something big and try to make a megablooming beefsteak.