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You can grow just about any low-maintenance plant in a terrarium, but you’ll need to choose plants that will grow well together. Get a selection of plants that grow in similar conditions in the wild, such as woodland, desert, or tropical plants.  For instance, if you choose a woodland theme, you might grow moss, foam flowers, and hepatica. Many of these plants do best in cool, shady conditions. Desert plants, such as cacti and other succulents, do best with brighter light and low humidity levels. Tropical plants, like Tahitian bridal veil and Venus fly traps, like warm and humid conditions. Plants that grow really wide or tall aren’t the best options for terrarium gardens. Instead, stick to small, low-growing plants, or those that can be easily pruned down to a manageable size.  For example, starfish plants are ideal for terrariums since they only grow to be about 6 inches (15 cm) tall when they’re fully mature.  Some terrarium plants, like club moss, like to spread horizontally. You may need to trim them back to keep them from taking over the entire terrarium. Others, like the false aralia, need to be pruned to prevent them from getting too tall. You can use just about any kind of glass container for a terrarium, from a fish tank to an old-fashioned glass bottle. However, if you’re growing plants that like dry conditions, such as succulents, you’ll need a container that doesn’t retain too much moisture. Choose an open container with relatively low sides for these kinds of plants.  For example, a fish tank or an old punch bowl could make a great terrarium for some haworthia, hens and chicks, and mini-cacti. Avoid growing succulents or cacti in containers with tall or curved walls, since these retain more humidity and don’t promote good air flow. Tropical and woodland plants typically enjoy plenty of moisture, so they do best in more closed-off environments. If you have plants that need humidity, try using a container such as a jar, a vase with a broad bottom, or a Wardian case (which looks like a tiny greenhouse).  Some plants that do well in more enclosed containers include ferns, begonias, mosses, and ivies. You can even create a fully closed-off environment by growing your plants under a glass cloche or inside a bottle.

Summary:
Select plants with similar needs. Pick plants that stay small. Opt for an open glass container for low-moisture plants. Get a more enclosed glass container if your plants like humidity.