I bought a geometric terrarium and sealed the bottom so that it could hold water. Then I tried to grow some juniper from branches I cut around the neighborhood from junipers that had overgrown the sidewalk. The moss came from the back yard, and I got three different types. I grabbed some dirt from the garden and got a ride along rolly polly. So far it has been a few weeks and things are growing decently well. We will see if it survives long term. It can’t stay in the sun for too long as it acts as a greenhouse and will get steamy.