I love pilea plants. They're plentiful in variety, suitable for terrariums, and make cracking houseplants.
From miniature, button-leaved crawlers to the large, valleyed leaves of the friendship plant, pilea come in all sorts of different forms. The most commonly knowly pilea is the Chinese Money Plant, sometimes known as a Pancake Plant. It has almost perfectly round, succulent leaves, atop a thin stalk.
Although lesser known, when compared to the Money Plant, there are some fantastic crawling pilea. These look fantatsic in both terrariums and hangings baskets. My favourites are glauca, depressa, and pinokkio.
Pilea are quite hardy plants, as a general rule. Keep them dry, watering only when the soil is dry, place them out of direct sunlight, and keep at normal household temperatures and they should thrive. They grow towards the light, so if possible rotate the plant every couple or weeks or after watering.
Propagation is a doddle with these plants. The larger house plants will produce pups - little offshoots that grow around the base of the plant. Gently pull these up and transplant before the roots start to take hold. Usually this is afer 2-3 weeks of growth.
With the crawling varieties you can simply pull a small, rotted section away and transplant it. If possible, avoid doing this is the winter, but rather in the spring and summer months when root growth is strong.
Pilea in Terrariums
Whilst its true that pilea prefer dry, well-drained environments, they still have some perfect applications in terrariums.
Most practically, pop them an open terrarium with a tropical, or even succulent, potting mix. They'll do just fine here, adding some foliage and lushness to succulent and cacti displays.
If you're hoping to place your pilea inside a traditional, green terrarium you'll be glad to know that this too is possible. They like a well-draining mix, often with peat (or sphagnum moss). A well set up terrarium should provide this. My advice is to place a little higher up in your arrangement, to prevent any water pooling and promote drainage. Also, try to place it with other terrarium plants that are tolerant of occaionally drier soil, such as polka dots or ivy.