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.Blue Torch is a tall pillar type cactus
Caribbean Tree Cactus And here we thought cacti couldn't get any cooler. The Caribbean tree cactus removed a handful of VOCs from the air: of p-Xylenes, ethylbenzene and acetone, and of toluene, o-Xylene and benzene.