I had the same idea for a run, the chickens can fertilize the grapes year round, and my cochins LOVE grapes. I may be borrowing your plans, I hadn't committed to a set up yet, but I like that one!!
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I agree it would be too dark if you let the grapes completely cover it. Also, uncontrolled grape vines would probably eventually get so thick that they would destroy the arbor.This is an old post so not sure anyone is still watching, but I was wondering if that would make the run too dark? Would the chickens still get some sun during the day?