How to encourage plant growth of plants in a closed terrarium?

Question

How to encourage plant growth of plants in a closed terrarium?

Answer 1

I am wondering if this is already planted or if you are planning it. Terrariums are fun and you can be pretty creative with them. The first thing is to put a layer of charcoal and then some soil with a plant in it. Research the rights plants that thrive in a terrarium. I don't know about totally closed ones, because you mist them once in a while and if they seem too wet it is good to have a removable top to let them air out just a bit. The goal is to create the right amount of moisture and then they make their own rain. Lots of fun to put a favorite shell or rock in there. Mine had an old ceramic frog and an opalesant glass egg.I made one once that had a pathway made of aquarium rocks and a deer and a piece of mirror that looked like a little lake. They don't usually want the hottest spot, but good light is ok. Have fun.

Answer 2

Terrariums are miniature ecosystems, the point is not to have your plants outgrowing their container.  But good old MiracleGro will encourage growth.