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Photo Credit: Mary Ann Patterson

This interesting terrarium was found at the Philadelphia Flower Show.

The first decision you need to make is the type of container can you want to build your terrarium in. You can choose between glass jars, aquariums, large funnels, large bottles, clear plastic soda containers, plastic jars… . Really, just about any watertight, clear container that’s deep enough to allow for the gravel, soil and plants will work. As long as it’s got a lid (unless you’re trying to grow a desert terrarium) it should be okay. The lid locks in moisture, creating humidity and condensation. If done correctly, your terrarium can remain sealed for years without additional watering.

Next, you need to gather your ingredients. Be sure to use a good, light potting soil instead of garden soil. (Garden soil is too heavy for terrariums and may not be free of disease or insects.) The potting soil you purchase will probably be a soilless mixture, which means it’ll contain perlite or vermiculite, as well as be light and able to retain moisture.

Of course you need some plants. It’s best to choose slow growers that don’t need a lot of direct sunlight (unless you’re doing a desert garden). Local nurseries or home stores often sell small houseplants that work nicely, with variegated foliage or small flowers. Consider ferns, slow-growing groundcovers, Venus fly traps or pitcher plants, too. Add further interest by including some tall, spiky plants (like lucky bamboo or dracaena) or some bushy plants that’ll spread slowly (like a fittonia or palm). For a lush, low-growing groundcover, think moss or lichen.