flowering?

I am currently growing romulan haze, with is spouse to be 90% sativa 10% indica and i am wondering if i should flowering them earlyer then i ushaly would to allow for the stretch and the long period of growth? I dont know if this is in the right section but i tryed searching for it and nothin really comes up..

thanks for the help

ii say flower normally but anticipate it to double in size from the flow point.