Highest thc strain feature has been running annually in our hallowed pages for five years now. The previous high mark for potency was 28.35% THC for the Bruce Banner #3, set in 2013 at the Denver Cannabis Cup. Since that time, we’ve discussed at length just how high a cannabis flower could go, physiologically speaking, in terms of THC. Highest thc strain also discussed the various lab-testing methodologies used by labs in different states. We asked the experts if we would see an end to these skyrocketing values, or would cannabis simply continue to progress until we had buds testing at over 50% THC? The truth is, there has to be a ceiling at some point: After all, a flower can’t be 100% percent THC.