The method of fertilization and fertilizing the soil and culture substrates has an important role in the quantitative and qualitative production of agricultural and horticultural products. Four types of fertilizer formulas with different ratios of N, P and K and constant amounts of micronutrients were prepared as complete liquid fertilizers in the Soil Science Laboratory of Sheikh Baha'i Laboratory Complex, Islamic Azad University, Science and Research Branch, Tehran. In a randomized complete design, the effect of thirteen different fertilizer treatments along with a control including the use of different fertilizers at different times of vegetative and reproductive growth and each treatment in four replications on the growth of Tagetes was evaluated. Vegetative growth indices including final plant height, number of flowers and lateral branches, fresh and dry weight of roots, flowers and shoots were evaluated. Overall results showed that different fertilization methods and different fertilizer formulas had a positive effect on plant growth compared to the control. Changes in plant growth were significant compared to the control in fertilization methods and formulas. The best effect on plant growth was seen in treatment number 6 and this treatment is recommended for the growth of this variety of Tagetes. In this treatment, in the fourth week of planting seedlings from the first formula including the base ratio of nitrogen, phosphorus and potassium, 15-15-15 and in the fifth and sixth weeks of the second formula including the ratio of base nitrogen, phosphorus and potassium, 15-20 -30, was used. Manuscript profile