When should I harvest White Widow

Depends on the type of high you want. Regardless of terpenes and genetics if you harvest with milky trichomes it's the peak of the effects you get sedative and active high. If you wanted fully active high, harvest with clear+milky cristals. If you want it basically fully sedative, just hold on for a couple weeks untill its fully amber crystals and you got it. Its up to you. I like to harvest them at a point where some might say its a premature harvest, but i know what i'm aiming for, it just blast my mind everytime, since i need to be active and can't even risk couchlock i harvest with clear crystals. I get less yield but i get the high i want, and its better to get 70% of what you like than 100% of what you don't really want. Stay well, and good growing growmore