For over nearly ten years I've winterized (with the help of Juan V), my rooftop garden by wrapping the containers (which house my plants, shrubs, trees, and vines) in bubble wrap; to which we add a layer of burlap and then tie everything together with jute. I've documented my endeavors in a number of posts here on Blogger.
These efforts are also included within two of my garden-themed movies: It’s a Wrap! Bubble Wrap! and The Kiwi Speaks! Fifteen Minutes of Fame.. almost (which are on my Vimeo channel.)
My winterizing methods have helped to protect my flora over the years. They have also helped preserve my containers. Moreover, a number of birds which visit my urban garden have taken advantage of the burlap, as evidenced in the image atop this entry, featuring mourning doves alighting on, as well as perching within my winterized container.
Numerous images of this lovely bird type along with interesting facts pertaining to it, are featured in Cam's book, Words In Our Beak Volume One, which is available in a number of versions:
Please click here to go to my blog post that provides details as to where you can get these books.