We try to source our material as natural as possible. If the tea has term "Organic" in its title, then its a material with organic certificate; if it has "Natural Farming" in its title, then it is organically grown without a certificate; if it has "Wild" in its title, then it is wildly grown; if none of this term appeared in the title, then it is a conventionally grown material which will applied pesticide and herbicide in a safe range.