Unless the seeds came from a hermaphroditic plant (hermie plant=hermie seeds) it is likely that a stress-factor came into play at some point. Too dry, too hot, pH imbalance etc. can all contribute stress that can induce herm. characterisitics. Record as much as you can about your first grow to minimize mistakes in the future. Buy feminized seeds from a reputable breeder such as Attitude, Nirvana, Barney's etc. then, cater to every whim of the plant(s) to minimize stress. My personal recommendation is to get books on Botany/Horticulture and learn the basics from growing something as simple as a lettuce, or daisy's from seed. Transfer what you learn to your cannabis grow.
