The container must be clear, however, as tinted or cloudy glass reduces light and interferes with plant growth. Containers can be closed or open. Plants in closed containers must be tolerant of high humidity. Containers with large openings without covers may be used but will require more frequent watering to maintain humidity. An open container with plants that do not require high humidity works well with less frequent watering.
Open terrariums are drier and less subject to diseases.
Low-growing, dense plants are best. Large plants can be used and kept small by pruning. Choose plants for variations in size, texture and color, as well as their adaptability. Determine the location for the terrarium. Note the light conditions and temperature of this area.