Terrariums create the worst possible environment for succulents to grow and thrive. If your goal is to have happy and healthy plants, you need to keep them in an appropriate container and avoid succulent terrarium.
Also know, are terrariums good for succulents?
Succulents are perfect for terrariums because they grow relatively slowly but the condensation that may build up can kill the little plants if the right medium isn’t used. Line the bottom of the container with fine gravel or rocks. … Space plants at least an inch apart (2.5 cm.) so there is adequate air flow.