Critical purple auto

Your soil mix is too "hot" and this is what is burning your leaves, so no need for nutrients for another 3 weeks or so. Humidity is not the issue or a problem. Growing at 24/0 IS a problem though, go to a much more plant friendly and healthy 18/6.

Its not your humididty. I have germinated a seed and it had no issue in RH 25%. If your leaves are curling then your most likely feeding them to put. Or the soil you put them in has to many nutrients in it. Its hard to tell without knowing What your growing in? What your feeding and how much? Do you adjust the PH of the water your using?

After looking at your diary. Your issue is you are over feeding. Hard to see in purple light. You have nute burn. Which has also got your ph likely really low. Especially if you did not have run off when applying nutrition. Your nutrition amount and when is off. In soil it is feed. Water water feed in wet to dry cycles. If in coco your feed schedule is different.

Mechanical damage, it might just have been something you did while training it with the scrog net.

I would not top an auto flower mid way into flower like suggested below. that's just asking for issues and added stress to the plant, could cause it to hermi as the genetics are all ready flawed. Cheers,

High bro, I think that the other growers are wrong. It looks like you burned the main cola with the heat from your lamp. Could it be because your lamp has been to close to the main cola? I would top the plant (only the main cola) because the other buds seem to develop just right! Usually you do not top autoflowers because it doesn't increase yield but this is not a normal situation. You need to act and I do think that this is the best solution. Because you do not want her to use more energy for that main cola. She can use that energy to make the other buds fat and juicy! Enjoy your grow buddy!

I don't see any info on what nutes you're using or how much of them, but you've got a nitrogen toxicity working here (the clawing leaves are a dead give-away).... That's going to lockout calcium and magnesium and make it so the plant can't get at those nutrients. When plants go into flower, you need to knock back on the amount of nitrogen you give them and increase the levels of P and K... You say you've burnt your leaves but your lights are too far away for that to have happened and I honestly don't see that they're burnt. The 3-fingered leaves you're getting in the second picture can, along with indicating bad genetics, also be a sign of stress on the plant ... that stress can come from lighting or temperature/humidity swings or, again, just plain bad genetics. If this was my grow, I'd definitely be cutting back (by at least half) on the nitrogen and even considering a minor flush to get rid of the excess - but beyond that, I'd probably be ignoring the leaves and concentrating on the buds, pumping some good PK boosters to bulk them up even more and making sure the temperature stays as stable as possible (no greater swing than 10F)... I'd get her to harvest and then buy better seeds for the next grow! Good luck and have great holidays!

I think it might have something to do with the info your not providing..besides what everyone mentioned about the nitrogen &levels of nutrients already present in soil before you add nutrients ...the water & lighting could also be to blame ... yours is not listed but i recommend just full on watching Bruce Bugbee lectures about light & boosting the hours ...plants need darkness for a respotory stage and also boosting light is only beneficial when you can also boost CO2..

Specify more precise information on your equipment in your profile - and you will be prompted in more detail. In my opinion - the wrong light on flowering and a lot of fertilizer. Reduce fertilizer by 50% .