September is an intense month for our team. We went to tour of vineyards in the area of Korčula, Kaštela, the hinterland of Zadar, and Šibenik with the aim of collecting samples of the Maraština variety for the isolation of non-Saccharomyces yeasts and the identification of grape metabolites. We sampled grapes from 10 commercial vineyards located in Dračevica, Prapatna, Kruševo, Kaštel Kambelovac, Smilčić, Polača, Stankovci, Vukšić and Oklaj and from the germplasm collection of autochthonous varieties at the Institute. We determined the parameters of grape maturity, collected data on location and viticultural practices. In the laboratory of the Institute, we separated the obtained samples for microbiological and chemical analyses. We set up spontaneous fermentations in laboratory conditions with grapes from all locations.