The experiment was done in order to evaluate the influence of GA3 on carrot flowering and seed production, at ESALQ, Piracicaba, Brazil. The treatments were 0, 50, 100 and 150 ppm of GA3 and for each dosage, it was applied 1, 3 and 6 times, 7 days intervals, begining when top root reached, 1 cm of diameter. The results showed that GA3 may substitute flower induction by cold and seed production in all concentration studied. The best concentration of GA3 for seed production of "Denver" carrot was 100 ppm. Higher concentrations have induced plants with excessive vegetative growth.