A tropical thatch is a precious spice, which is only produced in Nanyang. Western catering industry calls it "lemon grass". It is an important spice for cooking curry and is widely used in western food at present. There is dry powder in the supermarket.

The natural faint fragrance of citronella is mainly used for beverage seasoning and cooking seasoning, which can greatly increase appetite and has other medicinal values;

Citronella itself exudes a natural and rich lemon fragrance, which has special effects of regulating stomach ventilation, waking up and strengthening yang; Citronella can not only make tea to dispel cold and treat colds, but also be used as seasoning by Dai people. Used to wrap the pickled crucian carp and tilapia with citronella, and slowly bake them with charcoal fire until the fish is cooked, and the taste is tender, smooth and delicious. It is often used as a spice for Thai food.