Zairai refers to 'native species' tea plants grown from seeds rather than cuttings, meaning each plant has unique genetic characteristics. Uji Zairai represents a collection of these older, un-propagated tea trees found predominantly in the Uji region of Kyoto. These trees, often centuries old, develop deep taproots that draw unique nutrients and minerals from the soil, contributing to a distinctive and complex flavor profile. When shade-grown for ceremonial grade matcha (e.g., for around 23 days), Uji Zairai produces a tea with an intense umami, a remarkably creamy texture, and minimal astringency or bitterness. It is celebrated for its incredibly pure, natural taste and deep, earthy aroma, often hinting at nuttiness. Zairai teas are rare and highly sought after by connoisseurs due to their unique character and heritage.