You can buy it online! Carya cathayensis in Lin 'an is a kind of Carya cathayensis grown in China. In terms of nutritional value, orthodox walnuts on the market are still very effective. Everything is introduced in this compendium of materia medica. Walnuts with good yield and quality are generally produced in organic walnut planting base in Fujiushan, Shandong Province and Aksu, Xinjiang. I hope my answer is helpful to you. .