This research deals with the effects of exogenous growth substances on germination of cotton 'IAC - 17'. To study the influence of the chemicals, cotton seeds were immersed during 22 hours in water solutions of (2-chloroethyl) trimethylammonium chloride (CCC) at concentration of 2000 ppm, succinic acid-2,2-dimethylhydrazide (SADH) 4000 ppm, gibberellic acid (GA) 100 ppm, indoleacetic acid (IAA) 100 ppm, and water as check treatment. CCC 2000 ppm delayed germination of cotton, reducing plant development. Soaking cotton seeds in GA at a concentration of 100 ppm before planting were found to result in a more rapid growth and that the germination is hastened. SADH 4000 ppm reduced the growth of the seedlings and IAA 100 ppm did not alter the germination or the development of cotton seedlings in relation to control.