The Stenocereus Pruinosus succulent is also known by its common name of Gray Ghost Organ Pipe. Over- or underwatering can cause discoloration. A: Yes, you can touch your succulent plants if you want to inspect for signs of pests or diseases. Here are some signs your succulent might be outgrowing their pot. Some people prefer to place a small amount of water under the container and let the cacti roots pull the water up. If it is completely dry when removed, it is safe to water. It should be kept out of direct sunlight. You can mist the soil once in a while or when it feels dry.