Marijuana seeds begin while the male marijuana plant fertilises the female plant. Breeders though will cross strains of marijuana to grow fresh types of marijuana seeds. You can purchase marijuana seeds from a lot of shops on the internet. Seed banks will generally sell regular or feminised marijuana seeds. Regular seeds while planted, will grow into a split of males and females. The split of males to females will depend on the kind of seeds, the breeder and most prominently, how the seeds are grown. For case, if the plant undergoes plenty of stress during the growing procedure, plants will have other possibility of becoming males. Feminised marijuana seeds have been treated in such a method that all plants will be definite female.