assorted blue cactus phenotype columnar cactus 

​Light: Thrives in full sun to very bright, indirect sunlight. Maximum light is the secret to unlocking that intense, powdery blue color. ​Water: Low water needs. Use the "soak and dry" method—water thoroughly only when the soil has completely dried out. ​Soil: Requires a gritty, highly porous, fast-draining cactus and succulent mix to keep roots happy and dry. these will grow into impressive giants adding color and spine variation to your collection.