The following hyperbolic ad copy is from Gurney's latest catalog, page
23, for the "Better Boy" tomato:

"Guinness record holder -- 342 pounds of fruit from one plant!"

The Guiness World Records web site doesn't report anything, and I don't
have their book.

But, I've grown Better Boys every year for the past 10 years and in my
best seasons I haven't come remotely close to anything like that. A
bushel or two maybe, but nothing near 342 lbs.

Assuming the claim is true, how do they do it?

J.