Phytotoxicity is considered to be a common occurrence in agricultural production that many farmers face due to improper application of plant protection products or improper fertilization. It causes reduced germination, inhibits the growth and development of the plant and has other harmful effects that cause deviation from normal growth and development of the plant. It can be caused, for example, by organic acids formed by the decomposition of incorporated fresh organic matter, which are found in plant, animal and microbiological secretions, metabolites, etc. These acids are considered to be inhibitors of crop growth. The aim of the study was to determine the phytotoxicity of acetic and citric acid at seven different concentrations using a germination test. The basic hypothesis of this study is that there is a difference in the phytotoxicity of acetic acid and citric acid, and that there is a difference between the test species, in this case watercress and cucumber. The effect of acid on the test plants was determined by the test of germination of watercress and cucumber, and the same was carried out according to the modified method of seed germination according to Zucconi and sur. (1981). In each Petri dish with filter paper at the bottom, place 20 cucumber seeds and watercress salad and add 5 mL of a certain solution of acetic and citric acid with prepared increasing concentrations (0.00 mM; 0.10 mM; 0.25 mM; 0 , 50 mM, 1.00 mM, 2.00 mM, 4.00 mM, 8.00 mM), and deionized water was used as a control treatment (0.00 mM). After seed placement, Petri dishes were placed in 4 replicates under controlled conditions at 25 ° C for 72 hours. The germination test included the following treatments: 1. two types of test plants (watercress and cucumber) 2. two organic acids (acetic and citric) 3. 8 different concentrations of acids. The following indicators were analyzed in the study: number of germinated seeds, relative germination, number of shoots, relative number of shoots, root length, relative root length, shoot length, relative shoot length and index germination. According to the results of the germination index, the watercress index of lettuce is higher than the germination index of cucumber. 59 On average and in both cases, the lowest phytotoxicity (in some cases phytostimulativeness) was shown by the 1mM solution, and the highest phytotoxicity was shown by the 8mM solution.