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A tiny amount of aged sake (koshu) is blended every year, making it a structured sake with a mellow aroma of fragrant tree. The palate shows complexity and displays a rich umami of rich which goes in depth. 每年都會混入少量純米古酒，令酒香如香木般沉穩扎實，並加添了複雜深遂的味覺享受，旨味濃郁。
Since 1987 the brewery has been growing their own rice for making sake. In 2008, they released a sake made from purely organic rice. In addition to JAS certification, Marumoto Shuzo is the first sake brewery to receive recognition at National Organic Program (NOP) by United States Department of Agriculture and being certified by the European Community.