I was told that it's a lot easier to sex plants then what people think. I have ten going right now and from the size deference you can tell. That to me looks like a male. I was also told that if the water leaves round up then it's a male, but if they round down, then it's a female. If your not a 100% sure I would just move it under a separate light until your a hundred percent sure! I hope this helps! Smoke up and have fun!!