I have allowed my 17 hens to free range in my backyard however they have scratched up all the grass from the yard and I am now experiencing some erosion that I need to stop. I need to restrict their space while I restore the yard, and the best area is a 15 x 15 space where a large Douglass Fir is growing. The chickens like to shelter under the tree anyway so I was going to move their 2 hen houses and then fence them in with the Douglas Fir inside the fenced enclosure. Has anyone ever had a tree growing in the chicken yard? The birds dig and scratch a lot more than I expected and I would not want them to damage the tree's root system. Any thoughts? Thank you in advance.