I need help with virtual villagers 3rd!?

Im trying to complete puzzle 5, and I already know how to complete it. It says that I need 3 adept farmers and a chief to dance around the firepit with fire, but since i've been getting food from the big peach tree, i can't get any food to grow fast enough, and there seems to be hardly any food on the peach tree. This is making it really hard to even get one adept farmer. Is there another way to grow food around the island? Plz Help me!