Pot experiment was carried out at the nursery of private farm Alaejaylat in Libya during 2020 to study the effect of humic and gibberellic acid on the growth, flowering and chemical composition of Tagetes erecta L. Seeds of marigold were obtained from local variety (orange flowers) and sown on first of March. After one month, seedlings were transplanted into plastic pots (30 cm in diameter) filled with sand/clay 1:1(v/v). The experiment laid out in randomized block design (RCBD)  with three replications, each block contains 10 pots and each pot had one plant. The experiment consists of seven treatments as untreated (control), humic acid (100, 150 and 200 mg/l) and gibberellic acid (50, 100 and 150 mg/l). Growth attributes were determined as vegetative growth  such as plant height, number of branches/ plant, leaves fresh and dry weight, flower characters i.e., number of flowers/ plant, flowers fresh and dry weight and chemical composition like Carotene pigments, total carbohydrates and total nitrogen. Results showed that high concentrations of humic and gibberellic acid recorded the best results of all studied characters, however, humic acid at 200 mg/l and gibberellic acid at150 mg/l achieved the highest mean values all vegetative growth, flower characters and chemical composition as compared with the control treatment which gave the lowest mean values of all studied characters.