Pogostemon helferi, also known as Downoi, is an aquatic plant that originates in Thailand. Due to its unique wavy leaves and ease of care, they’ve become a popular aquarium plant. They are often used as a foreground plant in various aquascapes. Pogostemon helferi can be planted in the substrate of an aquarium and will produce a beautiful low star-shaped growth pattern if given lots of light. Even though it will still grow in low light environments, the growth will not be as robust. The optimum parameters for Pogostemon helferi consists of a pH of 6-7.5, temperatures of 68-86°F (20-30°C), and high levels of nutrients.