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Recently, the national garlic productivity is very low because of pathogens, especially fungi. Efforts can be made to increase the productivity of garlic through the reduction and prevention of pathogenic attacks by using biological control agents. Microorganisms are one of the best biological agents. One type of microorganism is Trichoderma sp. This research was conducted at the Plant and Vegetable Research Institute (BALITSA) Bandung. The experimental design used was a completely randomized design with the type of treatment of garlic varieties. The varieties consist of varieties 1, 2 and 3. The parameters of the observations carried out in this study were the growth rate of garlic which included garlic height, root length and tuber garlic weight. Trichoderma sp. the optimal role is to increase the high rate of garlic plants by 0.8%, increase root length by 9 - 23%, and increase the weight of tuber weight by 21 - 51%.