'Gorogn's Grotto' is not cold hardy, so if you live in a zone that gets colder than 30deg F (-1.1deg C), it's best to plant this succulent in a container that can be brought indoors. It is actually a "formula" which is commonly used in the world container arrangements. This is probably the best guideline for designing an arrangement. With their spines or unique stems any type of Cacti will give your arrangement a beautiful texture. 3. No pre-fertilized potting dirt is recommended for potting cacti. Cacti plants are part of the Cactus family. There are more than 2,400 species.