Parallel Rotating Shelves, print out 2 lots and connect them with any length of wooden board to make a shelf that you can store plants on.

adjust the shelf pivot models to work with whatever bolts and hardware you want to use and at whatever width shelf you want (as long as you can print wide enough)

the numbers on the .stl files are for how many you need to print for one end of the shelves

just a little side note, you will need to add a spring/rubber band going from one end of the mechanism to the center, the strength required will depend on what you store on it. This will stop it from tipping if its not balenced.