Can you drill into the wall at all? You could just put a little wood rail or wire rail at the bottom shelves [like this ](http://Kate and Laurel Benbrook 2 Pk 24 ' Count Wood and Metal Wall Shelf Set, (Pack of 2), Rustic Brown/Black https://www.amazon.com/dp/B0759KM3P2/ref=cm_sw_r_apan_glt_i_6RB8ZTPMR7J53EXTJVKB?_encoding=UTF8&psc=1) or this. https://www.amazon.com/dp/B07GNVLCT5/ref=cm_sw_r_apan_glt_i_SSG8HRC4DHGSY7S3XT5P) I think you could do something like the second one, but used stained wood instead to make it look nice/a little rustic, which will fit with the plants. Just buy some from home depot or something.