Yamamotoyama, established in 1690, is Japan's oldest tea company and remains family-owned after 330 years. The brand revolutionized green tea accessibility by inventing sencha and later gyokuro, the pinnacle of green tea. Today, Yamamotoyama is a household name in Japan for both premium green tea and seaweed, supplying Japanese restaurants worldwide while continuing to innovate with organic, sustainably-grown product.