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Ivo Jeramaz, second from left, gives a tour of a Grgich Hills Estate's vineyard to visiting Ukrainian winemakers Wednesday, June 5, 2024, in Napa, Calif. (AP Photo/Godofredo A. Vásquez)
Svitlana Tsybak, left, takes a photograph of Ivo Jeramaz, center, with a pair cattle horns used for vermicomposting during a tour of a Grgich Hills Estate's vineyard Wednesday, June 5, 2024, in American Canyon, Calif. (AP Photo/Godofredo A. Vásquez)
Svitlana Tsybak, left, talks about wine made at her Ukrainian vineyard during a tour of a Grgich Hills Estate, Wednesday, June 5, 2024, in Rutherford, Calif. (AP Photo/Godofredo A. Vásquez)
Ivo Jeramaz, left, talks to Ukrainian winemakers about the regenerative farming method used at Grgich Hills Estate, Wednesday, June 5, 2024, in American Canyon Calif. (AP Photo/Godofredo A. Vásquez)
Ivo Jeramaz, left, holds up soil from a Grgich Hills Estate vineyard while talking to Ukrainian winemakers about regenerative farming Wednesday, June 5, 2024, in American Canyon, Calif. (AP Photo/Godofredo A. Vásquez)
Ivo Jeramaz, left, gives a tour of a Grgich Hills Estate's vineyard to visiting Ukrainian winemakers Wednesday, June 5, 2024, in American Canyon, Calif. (AP Photo/Godofredo A. Vásquez)
Ivo Jeramaz, left, talks to Ukrainian winemakers during a tour of a Grgich Hills Estate's vineyard Wednesday, June 5, 2024, in American Canyon, Calif. (AP Photo/Godofredo A. Vásquez)
Ukrainian winemaker Georgiy Molchanov, left, asks a question to Ivo Jeramaz, right, during a tour of a Grgich Hills Estate's vineyard Wednesday, June 5, 2024, in American Canyon, Calif. (AP Photo/Godofredo A. Vásquez)