If I'm not making anything up, I recall there being an announcement some time after Brodgar was established in the 2nd world which told everyone that the effect from beehives would no longer stack on top of each other and allow mega-growth.
I recall stumbling upon a little farm run by some guy, who I helped replant. It turns out he had so many beehives, the plants went to the next stage after being planted in just about 5 minutes or so. He was working like a slave. (What sucks though is that the announcement mentioned before took place just 2 days after I met the invidividual and his farm. After the announcement, he abandoned the farm and I have never heard from him since.)