you’re using a container with soil, lining the container’s base with a thin layer of activated charcoal atop a layer of rocks will aid in maintaining soil health and proper moisture levels. The charcoal will work to remove toxins and help prevent mold
How to collect, transplant, and care for moss. If you want to add moss to your pots or planters, this article explains how to establish it and get it growing. - Wonder if I could borrow & collect the moss growing in our backyard?