Japanese Koshu Yamanashi Wine and Grape Culture

Katsunuma, Yamanashi Prefecture, Japan — Koshu grape cultivation 1,300 years; modern winemaking from Meiji era; OIV registration 2010

Japan's most significant domestic wine culture centres on Yamanashi Prefecture's Katsunuma region — the cradle of Japanese winemaking and home to the Koshu grape (甲州), a pink-skinned vinifera variety unique to Japan with at least 1,300 years of cultivation history. Koshu was granted its own OIV (Organisation Internationale de la Vigne et du Vin) variety registration in 2010, the first Japanese grape cultivar to achieve international recognition. The variety is phenotypically unusual: thick-skinned, naturally high in acidity, with lower sugar content than most European vinifera, and expresses distinctive flavours — subtle citrus zest, quince, white peach, mineral, and a characteristic umami savouriness that makes it an extraordinary pairing with Japanese cuisine. Koshu wine is almost universally made in a delicate white wine style (neutral oak or stainless steel), though skin-contact orange wine versions have emerged and show particular food affinity. Yamanashi winemakers including Grace Wine, Château Mercian, and Suntory (Tomi no Oka) produce benchmark Koshu. Beyond Koshu, Japan cultivates Muscat Bailey A (a Japanese hybrid developed by Zenbei Kawakami in 1927) primarily for red wine. Japan's wine culture has grown sophistication rapidly since the 2010s with natural wine interest, orange Koshu, and sparkling wine development.

Delicate citrus, quince, subtle mineral, characteristic Japanese umami savouriness — the wine that explains why wine and Japanese food belong together