Here are five pictures showing whats going on with the top of my plant. The best way I could describe it is that its cauliflowering..
Hard to tell with a sport (mutant) as pretty much any odd characteristic could be attributable to genetics.
How close, powerful, and focused is your light setup again? You might try raising it a foot. If you see mad stretching you could drop it 4"-6". But I suspect your amount of stretch will not
markedly increase.
On this plant, I couldn't clearly make out the tri-foliate pattern that Tor noted, but I'm thinking he's right, because those plants can do strange things like this.
It definitely is a triploid plant. Look back at post #... Err, forgot it's the internet, lol (bad day). Here, reference his pictures:
It's why I wondered about the method the breeder used to create the seeds - although some sativas 30-40 years ago (and probably at many other points in history) were known for producing the occasional misfit.
As I mentioned earlier in this thread, plants with this mutation are not universally bad - some food-production crops seem to be more favored by growers when triploid because they might be bigger and faster-growing. Others produce small (sterile) seed which might be considered beneficial to the consumer (easier to eat) or to the entity that holds copyright (GM crops, anyone?
) since growers must continually purchase new seed. Also some plants are natural triploids (or other polyploids).
But often with cannabis plants the bud produced from such plants has been of poorer quality and/or lesser yield. Enough times that many people chop the sprouts as soon as the three seed-leaves are visible and just germinate another seed. However, as mutations are not cut and dried, this lack of quality is not guaranteed - people just hate to take a (some amount) better-than-even chance that they will be disappointed in some way at harvest time after investing the time and materials to get there.
I had one that grew tri-foliate for a few weeks and then changed to a normal bi-foliate pattern.
It doesn't look like this plant is going to revert. But such is the nature of unstable genetic conditions - they're unstable, lol. There's really no telling what the extra set of chromosomes might actually cause without taking the plant to harvest.