You can easily make a plant holder from scrap wood you have laying around from other projects! This holder was made from a piece of scrap of 2x4. You simply cut the piece to your desired length, use a hole saw to create the hole for your plants, and you're done! The one I have is anchored to the ledge of my apartment so my plants don't blow away. Your holder could be stained or painted to match the trim of your apartment.
Love this idea, how cute!