Grape Guide
Kerner
WhiteKerner is a white crossing of Trollinger (Schiava Grossa) and Riesling, bred in Württemberg in 1929 and cleared for planting in Germany in 1969. It makes fresh, fruity, Riesling-like wines with a lightly grapey edge, and remains one of the most widely planted modern German crosses, centred on the Pfalz and Rheinhessen, with a small but distinctive niche in South Tyrol.
Key characteristics
- Crossing of Trollinger (Schiava Grossa) and Riesling, bred by August Herold in 1929
- Buds late, giving useful frost protection
- Ripens mid to late season, reaching higher must weights than Riesling
- Susceptible to powdery mildew; vigour and yield need curbing for quality
- Full sibling of Rotberger and a parent of Juwel
Typical flavors
Major regions
Pfalz · Rheinhessen · Franken · Württemberg · Alto Adige (Eisack valley) · Hokkaido (Japan)
Also known as
Weinsberg S 25-30 · Weißer Herold
Kerner was designed to pair Riesling's acidity and aromatic profile with a more dependable crop, and it largely delivers. Wines are light straw to pale yellow, with ripe orchard fruit, a leafy or herbal lift and sometimes a faint muscat-like grapiness. Acidity is firm but generally softer than in Riesling, and the texture can be a little broader. At modest yields the style is clean and quietly aromatic; at high yields it turns neutral and simple.
Most Kerner is sold as an inexpensive, dry or off-dry varietal wine, as a component in white blends, or as a base for sparkling wine. Better examples come from restricted yields on limestone or clay-limestone soils, and from the cool, high terraces of the Eisack valley in northern Italy, where it produces taut, mineral whites. Among the major German crosses, growers value it because it tolerates a wider range of sites than Riesling does, and because it ripens to more sugar with firmer acidity than Müller-Thurgau, which explains its enduring appeal.
Kerner was bred in 1929 by August Herold at the state viticultural institute at Weinsberg in Württemberg, from the red Trollinger (known in Italy as Schiava Grossa) and white Riesling. Both parents were confirmed by DNA profiling in the late 1990s. Herold's seedling was first known as Weißer Herold and later named for Justinus Kerner, the Weinsberg physician and poet. Its breeding number was Weinsberg S 25-30.
The variety was protected and authorized for general cultivation in Germany in 1969, and planting expanded rapidly in the 1970s and 1980s as the Pfalz, Rheinhessen and Württemberg looked for reliable alternatives to Müller-Thurgau. German area is reported to have peaked at about 7,800 ha in 1992. It has since fallen steadily, to about 5,000 ha around 2003, 3,700 ha around 2010 and roughly 1,950 ha in 2023, as growers moved towards Riesling, Pinot Gris and fungus-resistant crosses.
Kerner is a full sibling of the red cross Rotberger, and was itself a parent of Juwel. It reached South Tyrol in the early 1970s and gained DOC recognition there in 1993. A less vigorous mutation, Kernling, has been recorded in England.
Compared with Riesling, Kerner copes with a wider range of sites and crops more heavily, and its vigour needs curbing by crop thinning or restrictive training to avoid dilute wine. It buds late, which gives useful protection against spring frost, and it ripens mid to late season, reaching higher must weights than Riesling in the same conditions. It is susceptible to powdery mildew and needs a careful spray programme or open canopies. It copes with cold winters well enough to be grown in marginal climates such as Hokkaido, English vineyards and high Alpine terraces. Quality is highest on lighter, stony or limestone-influenced soils where vigour is naturally limited.
The standard expression is a dry or off-dry, unoaked white with apple, peach and citrus fruit, a lightly floral or leafy edge and crisp, moderate acidity. German producers also make Kabinett and Spätlese styles with residual sugar, and the variety has been used for Sekt and for sweeter wines up to Auslese level. Because its acidity is lower than Riesling's, fully dry wines can feel rounder and sometimes slightly coarse. In South Tyrol the best bottlings show white peach and a taut, mineral grip with a longer finish, and are among the more ageworthy examples. Elsewhere Kerner often plays a supporting role in white blends, where it adds aroma and acidity.
Where it grows
Pfalz
The largest German plantings, about 580 ha in 2023, the stronghold of the variety, where it is bottled as a varietal wine and used in blends.
Rheinhessen
Almost as much Kerner as the Pfalz, about 570 ha, on the region's loess and limestone-marl soils, mostly bottled as an easy varietal white.
Franken
Smaller plantings, but some of the best German examples come from clay-limestone soils, with Reiss and Rainer Sauer among the producers.
Württemberg
The variety's birthplace, where the Weinsberg state estate and a handful of family growers still bottle it.
South Tyrol (Eisack valley)
A small but growing area on steep, high, stony slopes, producing the benchmark examples from Manni Nössing, Köfererhof and Abbazia di Novacella.
Hokkaido, Japan
Kerner is among the most widely planted Germanic varieties on Japan's northern island, where its cold tolerance suits the short, frost-prone season.