Kai Blanc (甲斐ブラン)

The Variety

Kai Blanc (甲斐ブラン) is a Japanese white grape developed at the Yamanashi Prefectural Fruit Tree Experiment Station from a cross of Koshu Sanjaku (a Yamanashi indigenous table grape with Koshu lineage) and Pinot Blanc (the Burgundian white). The cross was made in the early 1990s and the variety was released for cultivation in 1992 alongside Kai Noir.

The breeding logic mirrored Kai Noir’s — combine an indigenous Japanese-adapted parent (Koshu Sanjaku) with a serious European variety (Pinot Blanc) to produce a variety with both Japanese-climate suitability and international wine quality.

Style

Kai Blanc produces dry whites with moderate aromatic intensity, brisk acidity, and a clean restrained palate. Comparisons within the indigenous-Japanese white category place it stylistically between Koshu (more delicate, more bitter-mineral) and Pinot Blanc (more fruity, more body). The variety responds well to sur lie aging — a Yamanashi technique now applied across most of the prefecture’s serious whites — and to small-batch barrel work for premium cuvées.

Where It’s Grown

Yamanashi Prefecture predominantly, with very modest plantings elsewhere. Total plantings are small (under 50 hectares) but the variety has steady support among Yamanashi producers experimenting beyond pure Koshu specialization.

Why It Matters

Kai Blanc represents the deliberate project of building a Japanese white-wine identity beyond Koshu alone. Where Koshu has cultural weight and a long history, Kai Blanc has the structural advantage of being a contemporary cross designed for modern wine quality. Together with Kai Noir, the pair is the most significant 1990s Yamanashi breeding output.

Details

• Color: White
• Parents: Koshu Sanjaku × Pinot Blanc
• Bred at: Yamanashi Prefectural Fruit Tree Experiment Station
• Released: 1992 (alongside Kai Noir)
• GI status: Approved variety under GI Yamanashi