Flein

Flein produces non-alcoholic grape juices carrying 0.0% alcohol. The project grew out of Gross & Gross, a sibling venture that has since been discontinued; the Groß family continued separately under the Wein and Flein names. Flein's single-varietal grape juices come from Maria and Michael Groß together with other producers.^[1],[2]

Flein is produced by three partner estates drawn from three European regions, each managing its own vineyard, harvest, and sales. For the Flein project, two additional friendly wineries were brought in as partners alongside the two Gross families.^[2],[3]

According to Flein, the partnership includes Michael and Maria Groß, Harald Cronst of Kellerei Kurtatsch, Sebastian and Katrin von Schmidt am Bodensee, and Nika Mitteregger. Grapes are sourced across these producers, including Schmidt am Bodensee, Maria and Michael Groß, and Kellerei Kurtatsch.^[2],[4]

Flein has developed a written charter, the Flein Charta, to which all Flein estates have agreed as a set of shared standards. The producer positions its output as organic and naturally produced, vintage-typical, and made from single grape varieties or sparkling blends. All Flein products listed in the 2024 and 2025 vintages carry organic (Bio) certification.^[2],[5]

Flein's lineup comprises single-varietal (sortenrein) still grape juices and sparkling Flein Fizz products, with grape varieties ranging from Sauvignon Blanc to Zweigelt. The range spans non-alcoholic, single-varietal sparkling and still grape juices in red and white, all certified organic and hand-tended.^[2],[6]

The Flein 2025 lineup includes Blaufränkisch, Cabernet Sauvignon, Fizz Blanc, Fizz Chic, Fizz Rosé, Gelber Muskateller, Sauvignon Blanc, Vernatsch, and Zweigelt. An earlier account describes three still varietal expressions — Schilcher, Sauvignon Blanc, and Gelber Muskateller — alongside a sparkling version called Flein Fizz.^[5]

Grape sourcing across regions. Fruit is sourced across the partner estates. Harald Cronst of Kellerei Kurtatsch produces Flein beverages from grapes grown between 220 and 900 metres in South Tyrol, with red varieties at lower elevations and white varieties at higher elevations. Schmidt am Bodensee, based on the Bavarian side of Lake Constance, also produces Flein beverages, and Maria and Michael Groß contribute fruit as well.^[7]

• Kellerei Kurtatsch (Harald Cronst) — South Tyrol, 220–900 m; reds lower, whites higher
• Schmidt am Bodensee — Bavarian side of Lake Constance
• Maria & Michael Groß — source estate for the Fizz range