Lighting guidelines can vary depending on where the succulent is placed, indoors and outdoors. Provide adequate lighting. Water the plant only after the top inch of soil has dried. Your plant might not get enough water if the soil dries out too quickly during summer. This unique little plant grows in clumps that can reach up to four inches in height and about 12 inches in diameter. They can be placed in a window sill at the west or south side of a windowsill. A modern, white window sill pot like this one will look fantastic with the Bishop’s Cap cactus.