Flowering early outdoors?

I have a Hulkberry photoperiod that has always been outside. I’m in the U.K. we had the longest day of the year yesterday but mine has also gone into flower. Considering it’s getting 18 hours of sunlight a day it’s quite confusing. Mine is in a greenhouse which slightly restricts the amount of direct light, that’s the only thing I can think of.

Hi Experiment green it was rather young when I put it outside, probably around 10 days old, still a seedling. I believe it’s the correct strain, strawberry cough, as the lower buds are getting fragrant and really smell like strawberries. Odd thing is the breeder doesn’t offer an auto flower in this strain, only a photo period, which makes this all more mysterious. To confound things further I have another strawberry cough from same seed order that I kept inside longer under the LED. She is also outside now and flowering as well but a much bigger plant and earlier in the flowering process. My gut tells me something about putting that first plant out very early in its life somehow hastened the flowering process. As far as light they get plenty of sun, approx 10 hours a day. I’m in NY

How old was it when you put it outside? How long are your days currently? I'm northern hemisphere and we just had summer solstice so the longest day of the year for me has passed. My outdoor strawberry cough started flowering around the end of july/beginning of august. Possibly it's getting less light than it should...initiating flower early? Otherwise maybe they mixed your photoperiod with an auto...which can happen.

Yes she looks unstressed.but outdoor weed you can stress the hell out of them and they just get stronger and stronger

GM slave I considered that as well. I was told this can happen with photoperiods that are somehow stressed out but as I said she seems happy and stacking up buds fast, lower buds seem to be getting resinous as well

They likely mixed up a seed