Terrarium. To make a terrarium, choose a glass container with an opening wide enough for your hand. Gently add an inch or two of washed, fine gravel. Top gravel with a thin layer of activated aquarium carbon. (You'll find both items at your local pet store.) Next, add moistened potting soil, and you'll be ready to plant. Create a collection of plants, or showcase just one. Good choices include ferns, succulents, mosses, miniature moth orchids, African violets, and kalanchoes.
How to make the most of house plants
House plants, potted plants, succulents, ferns, fig trees, and green things in pots. Indoor gardening and botanical design.