Cactus and Succulents
Cactus and succulents are ideal terrarium plants since they survive the longest without water for days...watering them only twice a week though. Usually you don't water as much when they're inside a terrarium especially when it's sealed tight. Its moisture will naturally fill them up, like in a greenhouse effect. But I usually uncover my terrarium for minutes or so and mistily hand-spray them twice a week. After it settles in, I place the cover back on and revisit them time to time.