Actually the natural cycle in Ontario would be to flower from late July to early October, around 10 weeks. Obviously a hydroponic cycle is much more flexable though.
As far as I know they greenhouse uses shades on the roof and starts up lights during the winter months. I THINK they can take advantage of the sunny days too by retracting the shades, but I may be mixing up this detail with Supreme Pharms greenhouse which is highly advanced.
Hopefully BED can teach Tweed a thing or two about their 8 week total grow process and we can apply some of that IP with Tweeds strains to increase yields.