The Stenocereuspruinosus succulent, also known as Gray Ghost Organ Pipe, is also known. The most common sign of discoloration is caused by either over- or under-watering. A: You may touch your succulent plants to check for any signs of pests, diseases, or discoloration. 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. It can be watered as long as it is not completely dried when it is removed. Do not place it in direct sunlight.