About this 3D model
This object was made in Tinkercad. https://www.tinkercad.com/things/d0PaKk4EIYj it is a variation of my previous effort (https://www.myminifactory.com/object/37852), but with the allowance to stand by itself if the option is not to attach it to a wall. It thus can be used in a wider variety of situations. It has a watering well along the top, with a recess in the back for a hook. It is recommended you add stones to the bottom to avoid soaking the soil.