This experiment was investigated the effects of blending rate of used rockwool in on germination and growth of fruit vegetables in hydroponic system. A commercial plug medium containing 10% zeolite, 10% vermiculite, 5% perlite, 10% peatmoss and 10%, 30%, 65% cocopeat was used as the control, and the other media compounded with 10% of zeolite, vermiculite, perlite, peatmoss and 10, 30 and 50% of used rockwool. There was not significant difference in germination rate of cucumber, eggplant and pepper among the treatments. Also commercial plug medium and the medium of 50% used rockwool where not significant difference in growth. These results suggested the possibility of utilization of used rockwool as medium components for growth of fruit vegetables.