Begin by choosing the right plants for your terrarium. By design, terrariums are moist, warm environments, so you must choose plants that enjoy this. Many home improvement and department stores also have plant/garden departments that carry all the supplies you'll need. Ask someone in the nursery to help you in choosing plants that will thrive in your terrarium.
Succulents like aloe and jade plants do very well. Remember to start with small plants so that they will have plenty of room in the container to grow.
Cover your work area with newspaper. Place a 1-2 inch layer of gravel in the bottom of your container. Gravel helps drain excess moisture away from the plants' roots. Top the gravel with 4-6 inches of potting soil (depending on how
large your container is). Remember to leave enough space for the plants to grow taller. The soil should fill your container a little over halfway. Top the soil with a layer of moistened sphagnum moss. The moss helps support the plants and holds moisture. Carefully loosen your plants from their pots and plant them in the container. Leave enough space in between plants for them to grow
without crowding. Press the sphagnum moss around the base of the plants. Lightly water the container--just till the soil is uniformly moist. Place the lid on the container and you're done! Your terrarium will do best if placed near a window, but not in direct sunlight. You should always be able to see clearly into your terrarium. If it becomes very foggy with excess moisture, just crack
the lid until the moisture evaporates. In no time at all your plants will be growing strong!
