Additionally, internal fruit quality (primary and secondary metabolites) was assessed with the aid of high performance liquid chromatography/mass spectrometry (HPLC/MS) on the first four samplings. Foliar application of biostimulants resulted in a significant increase of early fruit yield, total fruit yield and total number of fruit in season with ca. 20% less sugar and a lesser content of phenolics BA and HA at the first harvest date. Differences in sugars, organic acids and most phenolic compounds were less uniform during the season but early-fruit wascharacterized byhigher levelsofanthocyanins. Theuseofbiostimulantsinstrawberryproduction is justified as the products stimulate generative development of strawberries, which produce 10% more marketable yields earlier in season.