Grafted seedlings have been used in watermelon production due to the absence of watermelon varieties whichare resistant to all races of Fusarium wilt. The research carried out in greenhouses in the spring of 2019 and2020. In the study, widely used hybrid commercial rootstocks Nun9075 and TZ148 from Cucurbita maximax C. moschata group, Argentario (hybrid) and 3335 from Lagenaria group, and PI296341 from Citrullusamarus were used. As a scion 187, 125, 11and 162 watermelon inbred lines which are developed byAlata Horticultural Research Institute were used. Additionally, each line was self-grafted. Ungrafted plantswere used as controls. In the research, parameters such as stem length, number of nodes on the main stem,main stem diameter, number of days from planting to first female flowering, number of days from planting to50%female flowering were examined. In terms of main stem length, it can be said that the plants grafted onLagenaria spp. and Cucurbita maxima×C. moschata hybrids generally gave higher results. Although thenumber of nodes in the main stem and the diameter of the main stem varies by years, higher results wereobtained in those grafted on the Lagenaria spp. and Cucurbita maxima×C. moschata hybrids. Although thefirst female flowering time and 50%female flowering time varied by lines and years, it was observed that plants grafted on 3335 and control plants were earlier in flowering, but grafting did not has statisticallysignificant effect.