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You have to tell us some things about how you are growing or something dude..
What are they?
How old are they?
What are they in? soil, hydro, coco??
What are you feeding them and how often?
What temps and humidity is your room?
Have you been watching your pH of you waterings/feedings and medium ?
When did the yellowing start?
Having said all that it looks like a nitrogen deficiency as well as P and maybe K as well.. But it could be a toxicity even so tell us some details for a better diagnosis.
As said above. It look like an N defficiency.
It could be that you are not feeding enough or that you are experiencing a lockout.
Some more info about your grow would help.
Thanks,I am not sure what are they, there is a chance its maui wowei or desert qween, it is about 2.5 or 3 month old, it was outside all the time and now i put it in the closet in 12 12 mode, its in soil, i am feedeing water with a little bit of organic fertilizer, im feedeing it every 2 or 3 days, when soil feels pretty dry, now i started using air conditioner so the room os about 26 degrees, before there were 2 or 3 days of 30 degrees in the closet, humidity is around 40 sometimes 50, ph of water is around 6.5, the yellow leaves started a month ago but now its a bit all over the plant.
Also when the plant was outside it started flowering after about 2 or 3 weeks and had great smell but was very small, and after a month or more it came back to vegetarian mode abd the flowers from the begining became dry and brown, now its back to the flowering mode in the closet
In my humblest of opinions... one either grows indoors or outdoors. Flip flopping them between the two is not recommended! Nothing wrong with starting them indoors, and aclimatizing them when they go outdoors but, once thre, let mother nature takes it course. Your job is to maintain their moisture level and feed them. If that is the nutes you have for them (e.g the only nute you are using) it is insufficient and definitely cannot support flowering demands!
Yeah but its the length of time that the roots have been in that space.. They will have hit the sides after 4 weeks, and then just started spiralling, which is not the end of the world but it really depends on the soil they were in.. Id expect it to look very light brown and lacking in organic matter, unless it was being mulched and top dressed, after 2.5-3 months.. that's practically a full cycle and that takes feeding or potting up, when they went into flower they really needed to go into bigger pots..
As you said though I cant really tell either what size pots they're in.
Its never really too late to pot up plants, I'd lift em out and see how bad it is because if they're solid they'll struggle through flowering.. Only my opinion though.. I normally pot up a week before flowering into a higher phosphorous mix but that's doing organic soil.. In soiless mediums you're practically just doing coco..