Introduction to flower mats: Flower mats, a specialty of Le Cha Village. The flower mat is made of woven grass. Coriander, also known as Coriander, is a perennial herb that likes to grow in swamps, low humidity or at the junction of salt and fresh water. Commonly known as mat grass, salt grass, and three-edge grass among the people, it is called cow grass or guan grass in Dongguan.