I have huge old mulberry right where I want to put a run. Is it OK for chickens to eat large quantities of mulberries??? Should I avoid the area.?? I know other birds eat them like crazy. I have the purple stains all over ... everything... to prove it. It's more a case of eating large quantities. This tree produces TONS of berries e every year. In fact last year during peak production the berries were almost an inch deep around the base of the tree to a radius of about 10 feet. I've never seen a tree produce do many berries. And what about the leaves??