Red wine grape · Vitis vinifera
An Austrian red wine grape created in Klosterneuburg in 1922 from St. Laurent and Blaufränkisch.
Austrian Wine records the 1922 creation by Fritz Zweigelt at Klosterneuburg from St. Laurent and Blaufränkisch. UC Davis FPS independently records Austria, the same parents and the same crossing year. No maternal or paternal assignment is inferred from the order of names.
Austrian Wine describes medium-sized, densely berried, cylindrical clusters and round bluish-black berries. It also describes high fertility requiring yield management in its Austrian context; this is a reference observation, not a pruning instruction for a particular site.
Austrian Wine discusses grape wilting during ripening in connection with interacting stress factors, while explicitly saying the complex causes are not adequately explained by available research. This profile does not diagnose wilting from soil moisture or convert that discussion into a treatment, nutrient dose or irrigation threshold.
Reference review · November 9, 2026
Independent institutional variety record used to cross-check cultivar identity and naming. It does not independently validate every agronomic observation in Plantgrape.
Austrian Wine Marketing Board cultivar reference supporting breeding history, names and source-specific cluster and stress observations. Undated acreage figures and an internally inconsistent historical distribution sentence are not reproduced.
Cultivar descriptions are source-attributed reference material, not site prescriptions. No numeric soil-moisture threshold, disease diagnosis, regional suitability guarantee or GroundWorx performance claim is established here.