Istraživana je dinamika rasta ploda sorti: Springold, Redhaven, Suncrest i Fayette u ekološkim uvjetima Ravnih kotara. Breskve su uzgajane u obliku vretenastog grma na podlozi GF 677. Rezultati istraživanja predočeni su u tablicama i grafikonima. Rast ploda slijedi dvostruku sigmoidnu krivulju na kojoj su istaknute dvije faze bržeg rasta i jedna faza vrlo usporenog rasta. Prva faza brzog rasta traje oko 65 dana za sve četiri sorte. Druga faza rasta traje u sorte Springold 5 do 7 dana, u sorata Redhaven i Suncrest 28 dana, a u sorte Fayette 35 dana. Treća faza ponovnog bržeg rasta traje u sorata Springold i Redhaven 14 dana, u sorte Suncrest 21 dan, a u sorte Fayette 10 dana. The dynamics of fruit growth of the varieties: Springold, Redhaven, Suncrest and Fayette in the ecological conditions of Ravni kotari were investigated. Peaches were grown in the form of a spindly bush on the rootstock GF 677. The results of the research are presented in tables and graphs. Fruit growth follows a double sigmoid curve, where two phases of faster growth and one phase of very slow growth are highlighted. The first phase of rapid growth lasts about 65 days for all four varieties. The second growth phase lasts 5 to 7 days in the Springold variety, 28 days in the Redhaven and Suncrest varieties, and 35 days in the Fayette varieties. The third phase of faster growth again lasts 14 days in the Springold and Redhaven varieties, 21 days in the Suncrest variety, and 10 days in the Fayette variety.