Capsicum, scientific name is Peperomia tetraphylla, also known as watercress, emerald capsicum, green leaf Jasper, watercress Ruyi and a column of incense. Fleshy, tufted herbs, creeping stems, many branches, dense leaves, nearly ovate berries, flowering from February to April and September to December. It is produced in Taiwan, Fujian, Guangdong, Guangxi, Guizhou, Yunnan, Sichuan, southern Gansu and southern Tibet. It is distributed in the Americas, Oceania, Africa and tropical and subtropical regions of Asia. Watercress Green likes warm and humid semi cloudy environment. It often grows on wet stones or dead trees. Douban green is suitable for small potted plants. It has a certain purification effect on formaldehyde, xylene and second-hand smoke. It is a plant with good radiation protection.