- 1). Decide on the type of plants for your terrarium garden. The size of the plants depends on the size of your container. Typically, plants in 2- to 3-inch pots work for a glass case. Native or tropical plants will grow well in this environment; plant one type or the other, not both, as they have different nutrient and water requirements. Some native plants include ferns and goldthreads. Tropical plants suitable for the terrarium include African violets and dracenas.
- 2). Plan the design for your garden. Place taller plants in deeper soil in the back of the terrarium if you will view the garden from the front. If you will view the garden from all sides, place the larger, taller plants in the center and plant the smaller plants around them. Consider adding natural objects like pieces of wood or decorative stones. Don't include too many ornaments, however, as the plants need to utilize the space, air and water and the area will take on a more artificial look, rather than the natural look of a garden.
- 3). Place a 2-inch layer of smooth pebbles along the bottom of the aquarium. Use your hands to even out the layer.
- 4). Spread a thin layer of sphagnum moss over the pebbles. The moss helps keep the soil from making its way down into the rocks, leaving it around the plants where needed. It also provides the natural look of a garden or forest floor.
- 5). Add just enough potting soil to cover the roots of the plant. Place the plants in the terrarium and fill in the soil around them. Do not crowd the plants, as they need space to grow and develop root systems.
- 6). Water the plants. Moisten the soil completely. Cover the terrarium. If you don't have a lid for the aquarium, cover it with a piece of cellophane plastic. Secure the plastic with tape.
- 7). Check the soil every two to three days to determine whether you need to water. Press into the soil with the end of your finger. If the soil is dry, add water until fully moistened.
- 8). Prune dead or yellowing leaves to make way for new growth. Keep new growth trimmed back away from the sides of the glass to keep the plants a suitable size for the glass container and to help keep bacteria growth to a minimum. Plant leaves resting against the damp, humid glass are just the right breeding ground for bacteria or fungi.
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