I live in an area with a high water table, and have been tossing the idea around of putting in an
underground greenhouse but I've been holding off for a few reasons. The high water table is definitely one. No one really has full sized basements around my area because of the water table, and those that do have a lot of moisture/mold issues. However, I don't think it's totally out of the question if you can find the right spot. Other options I've been considering are just a nicely done lean to, or converting a space inside my house into a
greenhouse (my husband even said he would possibly maybe let that happen! wow!) but I haven't been able to commit to anything yet. Except for cold frames - I might commit to those. Not a big commitment