Herb-flavored Carya cathayensis in Lin 'an, Zhejiang Province, is selected from walnuts. The climate in Lin 'an area is suitable and the soil is fertile, which is beneficial to the growth and development of walnuts. Carya cathayensis in Lin 'an is influenced by the mountainous climate because it grows in mountainous areas, and its oil content is higher and its taste is more intense.

Baicaowei has strictly screened and selected Carya cathayensis in Lin 'an to ensure that only intact, moth-free and high-quality walnuts are selected.