Gyokuro is the highest-grade Japanese green tea, shaded before harvest to produce a sweeter, umami-rich flavor.
Unlike ordinary sencha, gyokuro tea plants are covered from sunlight for about 20 days before the first flush is picked. This slows photosynthesis and preserves more L-theanine while reducing some catechins and tannins, creating a dark-green tea with pronounced savory sweetness and less astringency.
The name gyokuro means “jewel dew” or “jade dew.” Tea merchant Yamamoto Kahei is credited with popularizing the style in the 1830s after observing that shading changed the leaves’ aroma and flavor. Much of Japan’s gyokuro now comes from Yame in Fukuoka Prefecture, along with important production areas in Kyoto and Mie.
Gyokuro is often confused with matcha. Matcha is shade-grown too, but its leaves are processed into tencha, dried, and ground into powder. Gyokuro remains a leaf tea and is usually brewed with cooler water to emphasize its sweetness.