Liangfencao, also known as jelly grass, has always been known as the "Four Treasures of Zengcheng" together with lychee, simiao rice and black olive.

Among them, Paitan Town, a mountainous area in the north of Zengcheng, has the largest output and the best quality.

Paitan jelly grass has thick leaves, young branches, black and shiny color after drying, and is rich in mucilage. It is the best raw material for making "jelly cake" and herbal tea.

It is transparent dark brown in color and has a special fragrance. It is smooth and delicious when mixed with syrup. It is an ideal natural heat-clearing and relieving food in midsummer.

Herba jelly can also be used as medicine. It is cool in nature and sweet in taste. It can prevent and treat heatstroke, colds, and high blood pressure. It also has certain curative effects on joint pain.

Paitan jelly grass has long been famous and widely planted. During the harvest season, merchants from all over the world go to buy and stock up, and then export it to Hong Kong, Macao and Southeast Asian countries such as the Philippines, Singapore, Thailand, Indonesia, and Japan.

It is said that 80% of the raw materials required by the famous herbal tea brand "Wanglaoji" are from Paitan's high-quality jelly grass.

In 2010, the General Administration of Quality Supervision, Inspection and Quarantine decided to implement national geographical indication product protection for Paitan jellygrass.