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Saw this on icmag and thought I would repost. The OP was a few years old.
Quote: Fertile female flowers can be induced in male plants by ethephon (2-chloroethanephosphonic acid) and NIA 10637 (ethylhydrogen-l-propylphosphonate). Interestingly, stamens could be seen arising even from fruits. Stopping the application of growth regulators caused the plants to revert to their original sex. We hypothesized that in Cannabis, GA and ethylene act as male and female hormones respectively, and that the expression of sex is controlled by a balance between their endogenous levels. Abscisic acid (ABA) is able to overcome the GA induced male flower formation (Mohan Ram and Jaiswal 1973; Mohan Ram and Sett 1985).
Mohan Ram H Y and Sett R 1985 Cannabis sativa; in CRC handbook of flowering (ed. Halevy A H) (Boca Raton: CRC Press) Vol. II, pp 131–139
Mohan Ram H Y and Jaiswal V S 1973 The possible role of ethylene and gibberellins in flower sex expression of Canna- bis sativa; in Proceedings of 8th International Conference on Plant Growth Substances (Tokyo: Hirokawa Publishing Co) pp 987–996172
Although many environmental groups worry about toxicity resulting from use of growth hormones and fertilizers, the toxicity of ethephon is actually very low, and any ethephon used on the plant material is converted very quickly to ethylene