[Sticky] Cannabis Plant Diagnosis
Cannabis Plant Problems
So, you have a sick cannabis plant? Don’t worry, most problems are easily fixable. But for the best diagnosis of your plant, we need some information from you. The more you can answer in this form, the less questions have to be asked, saving precious time, and getting the problem solved faster.
Step 1: Fill out the Cannabis Plant Diagnosis Form
Grow medium (soil, coco, hydro):
PH of your nutrient solution ( Feed):
PH of the run off, or Reservoir:
EC/ PPM of Nutrient Solution before Feeding:
EC/ PPM of the run off, or Reservoir:
Nutrients Brand, and how many ML per litre of which foods.
Grow room temps lights on/ lights off ( On/ Off):
Grow room humidity lights on/ lights off (On/ Off)
Res temps if hydro:
Lighting type and wattage (hps, led, cfl):
Extraction (Size of Extractor, and where you draw and exhaust air from):
Anything else you think might be important, such as a previous health problem you tried to fix, an early infestation of bugs, or a big change to the environment, leave here:
Step 2: Highlight the above text, and copy it to your clipboard
Once the forum is filled out to the best of your ability, click on the link below. Start a new topic, and paste in this form.
Once a new topic has started, add a title, and then paste in your filled in diagnosis form.
Usually a problem can be well on the way to being fixed within 24 hours. If you’re unsure of what to do, don’t do anything! Just fill out this form and post it in the infirmary, and someone will be right with you.
My auto has rust colored brown spots. It's only on a few leaves at the top of the canopy. It's not mold but some kind of necrosis. One site suggested a calcium deficiency. I'm not worried yet, because
the rest of the leaves are looking great. Just curious.
It looks to be in the cal/mag area. I'd say at this point of the grow and by the look of some leaves in the picture it's probably magnesium deficiency leading to calcium uptake deficiency.
Definitely looks to me like magnesium and calcium deficiency leading to lack of chlorophyll. Mist with leaves directly with plain epsom salts mixed 1/2 teaspoon per liter of dechlorinated and pH'd water when your lights are off. You should see a big improvement in 12-36 hours if it is only magnesium. Lack of magnesium leads to calcium deficiency, too, causing the brown spots (necrosis), so it may need calcium too. A lot of people use calmag to get both at the same time. Hope that helps out.
I am running Jack's 321 light in hydro. 1st time for Jack's with an auto. All the other autos I've run were not heavy feeders. I was leary of upping the PPMs. I did see a little leaf tip burn so I wasn't sure if cal-mag or other nutes would burn it more.
For new strains I usually increase nute concentration till I see a light leaf tip burn then back it off. Maybe I backed off too much. 🤔
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