When frostbite occurs, your succulents will rot more quickly if they are not watered soon enough. Monocarpic succulents end up dying because they are unable to flower. These succulents can become very difficult to remove or prune when they get too big. A 12-inch container is all you need to make this easy and colorful succulent garden. You can save and reuse cuttings, but you will need to remove them from the decorated object and start again. Other cacti begin as spherical, but eventually become cylindrical. Some (collectively called ceroids), turn into tall, spiny column-like cacti.