How do you care for a white succulent? This is vital because if your soil doesn't have enough oxygen, your plant will become suffocated and rot its root system. This can cause plant disease or even death. Some cacti's spines can break off plants easily and penetrate animal skin. This cactus has spines that curve towards the body. It can be a deep cinnamon brown or bright white color. Haageocereus tinis is the most expensive cactus ever sold, at $250,000 As it thrives in partial shade, the Haageocereus tinis, which is valued at $250,000.