So my husband has built these lovely flower boxes for around the coop. Any suggestions on what to put in there? I was planning on planting mint, but it will die back in the winter. It will come back in the spring since it's a perennial here. Heard it helps with mites and such. I would love to have some type of evergreen mixed in so it stays green in the colder months, but I don't know if anything other than pine trees and that won't fit I the box! Any thoughts of what you'd plant? Thanks in advance!