How to prevent (adult) trees getting berries?

Hey! I would love to get adult trees without berries, but how do you do that??

Ive read about max amount of trees? But does that mean you plant 250 berry trees on the map (with berries) or can you mix them and for example plant first 250 pine trees??

And what will happen if you remove all those berries (of the first 250 trees). Will they grow back?