It shows off the form and texture of succulents, just as any container garden. A good example is the Christmas cactus. This allows for better airflow and lower humidity in the terrarium. This plant can grow up to 1.5ft tall and doesn't require a lot water. "This group has undergone mitosis." As I pressed it with my fingertip, I expected that the plump cell would yield like a water balloon. But, it was firm. Nancy had a vision of a succulent mermaid's yard. Nancy picked "plants with strange forms or textures and that looked similar to underwater plants or marine creatures" when she began it.