Leaves curling up - Any advice is greatly appreciated

Hey friends,

So my plants recently started to show so weird deficiencies in their photo period after entering flower. No symptoms have been present before like this, but I recently made some changes to my room....I added co2 burner and put in a mini split, room has been staying colder then previous. no change in nutrients. I think i may have been over watering the first new batch of flowering plants....Let me know what you think please, Cal? K? Over watering? happened to 9 plants not just one of two...Thanks guys.

more info.....plants under 8k watts, temp stays around 78 w light on, drops to high 50s during lights off, 10 gal pots, soil-less (pro mix cut with coco croutons), feeding with general organics (have been for years), i think it has to be a change in my environment. I just brought 9 new plants into flower a week ago and they are starting to show similar symptoms.

RandyHighwood said:

more info.....plants under 8k watts, temp stays around 78 w light on, drops to high 50s during lights off, 10 gal pots, soil-less (pro mix cut with coco croutons), feeding with general organics (have been for years), i think it has to be a change in my environment. I just brought 9 new plants into flower a week ago and they are starting to show similar symptoms.

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I have lot of experience with general organics. are you transition feeding in weeks 1-3 and then supplying a PK booster For weeks 4-6? I use humboldt bloom 0-10-0 and technaflora S.S. 1-1-16 for the PK boost. i use 15ml per gallon of the biothrive when i switch to bloom increasing upto 20. Also i suggest you buy a heater, 78 down to below 60 is no good, keep it at 68 minimum.

Have you tried measuring the pH daily? Also ppm, or ec. It can be plenty of things, ranging from nute problems, to rust, to disease. My advice, keep a journal, write down exactly what changes you see, how you've grown it up to that point, temp readings everyday, pH everyday, ppm everyday, keep track of growth, lights, be sure to have a steady light schedule, don't over nutrient being that its better to under feed than over feed. Be super and I mean SUPER clean. Check for stress. Plants are like children, the more you train and take care of them, the more you know their future will be bright. Always.keep that journal, to know what not to do next time. As far as a resolution, be certain to what it is, by keeping that journal. Journal will tell you, or someone else giving you advice, what you need to work on or if you have anything to correct, instead of just telling us what you think has happened. Hopefully you can have a better grow next time.