I would think jealousy, I've always wanted a green house but haven't ever made that commitment, I think I would be trying to grow lettuce in winter, I read if you fill barrels of water they will release the heat all night and keep stuff from freezing. I mostly use my shed windows and move my plants in and out, a greenhouse might have to go on my dream list.
That's a good size for one, all kinds out there, now you have me thinking.
I don't have cats in the house, but my dogs have been know to help out by eating some, or knocking them down, at one point I had to move all my house plants upstairs because the dog enjoyed tossing them around the house. Thankfully dogs grow out of making that kind of trouble, cats I don't think ever do.
We are also discussing plowing up a patch in the field to try to grow sweet corn and pumpkins, but I'm unsure how much damage the chickens would do to growing corn, probably dig up the seeds before germination, I have a two foot tall fence around some of my gardens and they don't go over it, but you can't plow with a fence around an area.