I have a variety I created that I call "Sumo". It's from a cross between two heirloom varieties, Enormous Plum and Florida Pink. I have selected from the plant with the largest fruit for 10 generations now, and it seems to be stable. The largest fruit I have gotten is just over 3 lb, but it was grown in partial shade without pruning, so someone who is serious about growing large tomatoes might be able to double that. The largest fruit seem to come from double flowers. I've never seen true megablooms (triples or more).
Send me a PM if you'd like seed.
Fred
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