I have a narrow area between our garage and our neighbor's. It's about 4 1/2 feet wide. The neighbor is a non-yard savvy renter who let the blackberries on her side get away from her and the bushes completely filled in this narrow area. Yesterday I spent 5 hours clearing out the prickly mess in the hopes that I can use the 4.5 x ~15 foot area as a secondary chicken run (we already have one that's about 5 x 7 feet). We have to get permission from the landloard to enclose the area since it's about 1 foot into their property. My question: Will the chickens keep the blackberry sprouts from the existing root systems at bay? I'd love to use that as a reason for their landlord to let us enclose that completely unused area as a chicken run.