Belonging to the Gramineae, it exudes a lemon-like fragrance, also known as lemongrass. It contains citral, citronellal, citronellol and so on. It is a natural aromatic condiment. Citronella is an essential herb in Thailand, Vietnam and Malaya. This herb can drive away wind after being eaten by human body, and its juice can be used as a natural mosquito to be afraid of water. Citronella is the main component of coconut curry in South Asia. In Thailand, citronella is the main raw material of Dongyin Gong Tang. In Vietnam, all kinds of famous citronella and sour soup are also essential. Large supermarkets have them.