My Sim lives in HoB, currently. He's on what was a vacant lot, about 50 X 40? I used a downsized version of his original house, making the outside more cottage in looks and he's got chickens in a small fenced off area in the corner, a Toddler gym to the right of the chickens, a spa to the left. Next to the spa he's got a found pot for his newly planted plantains and four plots of ground that came with Cottage Living. He grows just a few things. You should see how nicely his oversized pumpkin turned out. On the side of the garden is a build-in swimming pool. Can't be a Global Superstar without any of the perks, right? So, basically there is no room for a green house. I know, I tried. It's good to learn the bees can survive outdoors. :)
ETA:
https://i.imgur.com/yLv9QIg.jpg