I've grown Jack Herer a few times, and it does stretch quite a bit in the first 2-3 weeks of flowering. It actually grew too high in one case and I lopped off the top buds and dried them for early use, leaving the remainder of the plant to finish in it's own time.

The early stuff was a bit harsh, (they didn't get flushed to clear ferts)but did the job, and the plant did just fine with the new top buds. I didn't want the bending, because I'm sort of tight on space all around, so it wouldn't have helped.
farmermo Reviewed by farmermo on . Any Jack Herer Growers out there thant can awnser my question?? Hi I am growing Jack Herer and a little worried that they are gonna out grow my grow tent ! ,. In veg i let them grow to 23 inches (from bottom of pot is 36 inches)... and then turned them to flower , they are now 27 inches and only been in flower for 3 days!, My tent is only 78 inches high,. Will these plants slow down or will they continue to grow at that rate? I have about 24 inches spare which will leaves me around 12 inches between the light and plant, Will it out grow?? Rating: 5