There are a few varieties of pumpkin that grow especially large (Atlantic Giant and Big Max are two popular varieties). It’s pretty easy to get these varieties to grow 100 to 200 lb pumpkins. These varieties still have variance in the size of the resulting pumpkin that depends on the individual seed’s genetics, and the growing conditions.
After the normal maximums are reached it takes good care to keep the pumpkin’s weight causing it to collapse.
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