I'm just curious where everyone put their greenhouses. I tried mine in several locations and narrowed it down to about 3. I liked it in Halls of the Collosus in the Halls of the Lunar Champion at the side with the waterfall, higher up than ground level so would need stairs up and doorway facing out to the lake.
I liked it in Grand Psijic at the front over the small waterfall (left hand side facing the building) but I felt like it spoiled my view of the moons.
I finally settled with having it at the back right side of the Grand Psijic home to the right of the big waterfall at the back.