Plants dieing why...

Heat stress

Heat stress .... AC fixed problem

How is your drainage, what do u have for a runoff percentage of any? It looks like something brought on by overwatwring, but mistaken for a deficiency, when u tried to fix it by flushing it might ja e just made it worse. Ease back o. Ur nutes, I'm not sure if ur using recommend dosage but they factory recommend dosages are usually pretty high try cutting it in half if ur running it at full throttle, if u ha e already cut it back chop it in half again, MAKE SURE UR PH IS EIGHT AFTER U MIXN UR NUTES, and let those pots dry the hell out before u water, wait for them to start dropping Sonu know they are thirsty, do t water on a schedule, water when ur plants are telling u they need a drink. I ran I to something like this a good while ago, and I thought it was everything but what it actually was. And every time I tried to fix it I just made it worse cuz they didn't need anything I gave them, they just needed to really dry out cu I was overwatering. Try that out and see if it helps... Patience is crucial, soil esp is more forgiving, but can also be your worst enemy u just can't assume ur plant is ready for anything u have to wait and let it tell u what it wants. Good luck and I hope this helps u out. HANG IN THERE CANNABIS IS A VERY RESILIENT PLANT, And they will bounce back and u can Still get a decent amount of meds.

seems like root rot caused by high heat or over watering. control the temperature till the max of 28 degree celcius and have your pots dry before watering. feed with nutrients on only alternate water feedings.

I know they do that when nearing harvest.

Hi there! Looks just like my first grow! I think this is heat related issue so you might have too high heat compared to your humidity atm. Also I think calcium def makes it worse but in my case it was magnesium toxicity that caused calcium def. So adding cal/mag might not fix the problem if the calcium to magnesium ratio is of in the soil.. Not sure this is the case for you tho but still i'd say heat related. I have no idea how chlorine toxicity shows but I've read that it causes scorhed leaves etc and I also added Cacl2 (Calcium chloride) to my hydro so maybe it is chlorine toxicity? Just guessing but those symptoms looks familiar

You don't have a journal so there's no info to use. Like how old are your plants? How long have you been in flower? Have you looked at the trichomes yet? Cannabis plants have a life cycle just like anything else, and if your plants are at the end of it - because they are over-ripening - no amount of flushing or Cal Mag is going to do anything. That's like prescribing a multivitamin to a 95 year old and then being surprised when neither that nor liposuction makes them 25. Your plants look (over) ready to harvest: more info and I could be more sure but it isn't there. So going just off the pics, that's my guess.