While open terrariums are less humid than closed terrariums they still have above-average humidity, so plants like cacti, which prefer dry environments and infrequent watering, should be avoided.
Avoid succulents or any other drought-tolerant plant for closed terrariums because they can't withstand high humidity and regular moisture. While open terrariums are less humid than closed terrariums they still have above-average humidity, so plants like cacti, which prefer dry environments and infrequent watering, should be avoided.