If i wanted to grow a world largest vegetable. What are the secrets these guys use to grow the world largest vegetable? I know they typical use seeds from a previous harvest and then what? And i'm pretty sure, when they first started they didn't have a seed from gigantic vegetable.
Actually you would have to start out with seed from a cultivar selected for gigantism. Then it would be a matter of having suitable climate and cultural practices for that particular kind to get huge.
Now when they first started growing gigantic vegetables, did they start from a seed from a gigantic breed? Probably not, since it never existed then. How would one grow a large vegetable with out a large seed?
Oversize fruiting lines developed through selection and controlled pollinations, same as with those having white fruits, sweet fruits, tasty leaves and so on.