The melon plant (Cucumis melo L.) has high economic value, so innovation is needed in its cultivation techniques. This study aims to determine the influence of biochar and Trichoderma harzianum on the growth and production of melons in the hydroponic system of the substrate. This study was carried out at the green house of Taman Idjo Farm, Ponorogo, for three months with a factorial complete random design (RAL) consisting of two treatment factors, namely the dose of biochar (0 g, 250 g, 500 g, 750 g/kg cocopeat) and the dose of Trichoderma harzianum (0 g, 10 g, 20 g/kg cocopeat). The results showed that the combination of biochar and Trichoderma harzianum did not have a significant effect on plant height, number of leaves, stem diameter, and sweetness of melons. However, a dose of 750 g of biochar and 20 g of Trichoderma harzianum was shown to significantly increase the weight and diameter of the fruit. The use of biochar and Trichoderma harzianum can increase melon production, especially in terms of weight and fruit size.