Sansevieria Black Coral, also known as the Black Coral Snake Plant, is a striking and hardy variety of Sansevieria. It is well-regarded for its long, upright, sword-like leaves that are a deep green colour with unique, horizontal, lighter green banding. The contrasting bands on the dark foliage give it a dramatic and sophisticated look. Known as some of the toughest houseplants, they store carbon dioxide acquired at night to use during the day, then release oxygen at night, via photosynthesis, when their pores open. This helps it to maximize efficiency in cleansing the air, as found in a study conducted by NASA.