The Stenocereus Pruinosus succulent is also known by its common name of Gray Ghost Organ Pipe. Well, the most common sign is discoloration caused by over or under-watering. A: Succulent plants can be touched, but only if there are signs of disease or discoloration. Here are some signs your succulent might be outgrowing their pot. A few cacti enthusiasts prefer to put a saucer of water underneath the pot to allow the water to drain out. It is safe to water if it is dry after being removed. It should be kept out of direct sunlight. You can mist the soil once in a while or when it feels dry.