Vegetative in grow box and flowering outdoors? Tips and tricks is welcome!

ok I give up, I'll have to wait for September or October to harvest, it's not feasible as in a month and a half there will be 15 hours of light here, how about if I go down from 18 to 15 hours of light in the tent before putting them outside and then gradually acclimate them to sunlight?

think i misread the first time.. so these will stay inside the entire time? yes, that's exactly what you are supposed to do. if you want to take an indoor plant after it enter bloom phase and stick it outside, this would probably by unwise. you'd have to be certain it's getting a long enough darkness period outside or it would re-vege. also, it would have to acclimate itself to the sun. this may take a cycle of exposure and removal from the sun as it is a whole different context than artificial lighitng and the plant won't be able to handle it well. it'll likely be droopy, wilting and maybe even some spots within 1-2 hours of direct, intense sunlight. it can probably harden off to it, but if this is mid flower, it's not wise to stress it like this while growing buds. so yeah, anytime you control length of darkness you can cause the bloom phase. don't inerrupt that dark period and it'll turn out fine. it doesn't have to be a gradual change. the plant simplay shifts gears when it has a long enough dark cycle. it is a hormonal response.

The answer is simple as well... No The dark hours during your entire flowering period need to be longer than at least 10 hours per day. Otherwise the plant will go back into the vegging stage, this called revegging. When you want plants to flower early and harvest 2 times per summer you need to use autoflowering seeds. They are not stuck to the dark period and flower even with 24 hours light per day. So use autoflowers, they are better for outside. You can also choose to just grow during the 3-4 hottest months of the year to get better quality and yield. Enjoy your grow!