Pilosocereus azureus Blue Torch Cactus
Pilosocereus azureus is a spectacular blue cactus native to the semi-tropical areas of Brazil. Its dramatic color is amazing, even more stunning in the middle of green plants. The blue gets bluer as the cactus ages.
This is an excellent cactus for growing indoors on a windowsill or in your patio. It grows quickly, eventually to 12', but will stay windowsill size for several years. It needs full sun and almost no water. The brighter the sunlight, the bluer it gets.