Just make sure you remove the air plant once a week and water it by misting or dunking it into a bowl of water, before returning it to its terrarium.
You can pop an air plant in a terrarium on its own or mount it on a stone or piece of wood, or jazz up the display with other plants, pebbles or even fairy lights. Just make sure you remove the air plant once a week and water it by misting or dunking it into a bowl of water, before returning it to its terrarium.