The local tea shops in Japan all have banners out in front announcing the "new tea" or newly harvested tea leaves. People who really like good tea will spend a lot for good, fresh tea leaves. There are multiple grades of tea which are difficult to understand and often are specific to the store.
Shizuoka and Kyoto are easily the most well-known region for tea production in Japan, but other areas such as Kyushu also produce tea.