Hydroponics production means the most modern way of planting crops in a greenhouses.The cultivation of tomatoes in hydroponic cultivation ensures the exact a mount of nutrition in a ceration proporation, avoiding plant stress due to the lack of some nutrition and to achieve a faster growth and high product quality. The use of a growth enhancer insuch intensive breeding enables increase yield and nutrition value of treated plants. The goal of this study was to determine the effect of selected growth enhancers on growth of tomato, compared to untreated plants. The study was conducted in a heated greenhouse of the Vegetable Crops Department at the Faculty of Agriculture, University of Zagreb. Cultivars of tomato 'Fabiola', 'Abelus' and 'Clarabella' were tested, which were treated with biostimulants 'Bioplex' and 'EkoBooster' every two weeks after planted on the rockwool slabs. For each plant was determined the number of fruits, the weight of marketable fruits, yield and share of non-marketable fruits. Based on the results of this study we can conclude that biostimulants 'Bioplex' and 'EkoBooster' did not have a significant effect on yield, as well as the number and weight of marketed fruits. Highly significant differences in the share of non-marketable fruits were also observed with respect to the applied biostimulants. Cultivars not treated with biostimulators had the smallest share of not-marketable fruits (16%). The highest share of non-marketable fruits (28,7 %) had cultivars treated with 'Bioplex'.