Ok, the big gem grove cost $6.1M holds 3 animals and collects $80,000. The little gem grove costs $340,000 holds two animals and collects $50,000.
To me it is obvious that the only real benefit to the big grove is saving space. I just deleted a farm so that I could place my Cyclops and I have two others that I could add...to the math wizards amongst us, is the big gem grove practical??