We have a LOT of pesky Squirrels in our backyard. I used to place bird-netting over the racks and tables outside in Summer, but keeping Squirrels out of my stuff was almost impossible. And whatever the Squirrels dumped onto the floor was a tasty treat for the numerous Rabbits. DH came again to the rescue and set me up with a 30 foot cage in our backyard. NO MORE Squirrels!!
The cage had a previous life as a tool bin and was a discard. I love it!! I painted it green with rustoleum paint.
I could imagine that one could easily turn this into an all year greenhouse by covering it in Fall. (The panels came originally from wirecrafters.com)