I have a friend who has a large greenhouse with benches that line the periphery. Hers is a dirt floor greenhouse (like mine), this wouldn't work if you had a cement floor, but she dug 12 inch deep trenches the same width as the benches above, lined them with pond liner, edges with landscape timbers, and put stuff like water lilies and aquatic plants down there. The greenhouse is situated so that each trench gets sun, one morning, one afternoon. It works well. She also has fish in there (to eat mosquito larvae) and uses the water sometimes as a natural rooting place for stuff that can water root. It adds a lot of humidity for her too, and it very nice to look at.
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