Our chickens share an uncovered run with our goats. We would never be able to get anything to grow in there due to the goats. On the outside of the run however, we have apple trees, a peach tree, blackberry and raspberry bushes, oak trees and butterfly bushes. The chickens do eat the berry bushes through the fencing, so I need to get some hardware cloth for that area. We are building a new coop with a covered run that will be attached to the open run. In the covered run we will be putting branches trimmed off of manzanita bushes in the covered run for the chickens to play in and on and will hang a couple cabbages or other veggies for them to play with during the winter months when they can't get into the uncovered run.