We are revamping our current run & housing. The area we are utilising has permanent 2" x 2" box wire fence 4' high, with 5-6" posts every 10' on one side of the run. Inside the run area we have Hollie bushes & pine trees planted parallel to permanent fence. Run is 12-14' wide & 80' long approximately. We are using chain link panels for sides of run not enclosed by permanent fencing. Currently the pine trees are under 6' with plans to trim lower branches so as not to interfere with Hollies as Pines mature. We live in area that receives snow, ice, & freezing rain. The location can be buried under snow drifts 2-10' high depending on winter. ( no worries the chickens have area by houses where they are not buried. ) My question is what material do people suggest as cover for run and how do we incorporate the cover around the pines as they mature? I'm ok trimming lower pine branches to height of 7-8' to accommodate cover. Thank you.