Cannabis Plant Problems
Diagnostics Form.
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):
Strain:
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.
Step 3:Click here and start a new Topic
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.
@artmann Yep i concur with Monkey on this one, i have this issue crop up from time to time and usually its either lockout or a mag deficiency. Quick flush and up the calmag a few points and it should correct it for you.
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.
Random acts of kindness make the world a better place
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.
Thank you.
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. 🤔
This is the northern lights auto I'm growing that's almost done but a couple weeks. Was having a look around the other day and found a dead dried up flower on the stem and when I removed it saw a section of stem about 2 inches long had necrosis. Should I just leave this cola to do its own thing and hopefully not have the whole branch die before harvest or should I just get the shears and snip this thing from the plant before it spreads like cancer?
@improper_weed_viking looks like you are a little ways off harvest, I would take it off personally, last thing you want is it spreading or starting to rot on you.
Hey 
I'm growing this plant right next to my window. So far there weren't any problems but I had to leave for a couple days. Installed a watering system and put some nutrients in the water. Weather was especially hot during these days.
As I came back the soil was pretty dry and the water bucket was empty. The following days I watered them as normal and gave them some phosphorus fertilizer.
Now I'm unsure if I overdid it with water, fertilizer or both.
Thanks in advance for any help
Strains are Gelato#45 and WeddingCake
@vianese Im afraid its just not enough light. They need to be outdoors or under a grow light, next to the window is never enough. It just wont be getting enough light to produce the food it needs. Can you put it outside at all? It looks like a decent size, but its at a stage where it really needs a good amount of light to go any further
@macky Unfortunately I can't put them outside and atm I can't afford a grow light. Since this is the only possible way to finish the grow I will just water them as usual and see where it goes. Indoor equipment is on my bucket list
Still thanks a lot for your help.
Thoughts on this?
Pineapple haze, week 7 of flower. Organic feed, although she's been a heavy feeder. We've had plenty of bugs in the garden, but she seems pretty left alone so far.
Appreciate it
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