Pour a 1" - 2" layer of gravel into the bottom of the container.

Add a layer of activated charcoal.

Lay sheet moss over the charcoal, patching pieces together if needed.

Pour in your potting soil - about 2" thick.

Add your plants, topping with some more potting soil where needed. Lightly water the plants and spray the sides of the container to remove any bits of soil or moss.

Add your decor, if using.

Trim the plants if needed to achieve a more pleasing shape. If making a covered terrarium be sure to cut any leaves that touch the lid.