Were here to help. 1love.Who is George C
Its in these pages I copied from the book I have im sure. Google also has some great diagrams that I've been looking over today.
Although I like it when I get to ask real live people some of the things I'm am unsure of.
Plucked this one the other day , just noticed it grew back. I wanna get rid of the purple on the stems before I flip to 12/12. The other plants I've topped have grown out quite a bit.
Somethings been eating on them too.
Some strains have purple in the stems and petioles and it's genetic, but It can also be caused by cold temperatures or a lack of Phosphorus.
If you are feeding them properly and temps are good id say its in its genes.
I personally preload the plants in veg with a shot of bloom nutrients a week or so before I flip to flower, and ive noticed that it seems to help them flower faster but it also prevents to some degree the purpling that stretch sometimes causes. So you could safely try a dose of bloom nutrients now and see if that helps to restore some green to the stems.
is it possible you have a catterpillar? or something bigger, not hidden? or a cat... cats chew plants lots.