Should I be worried about the leaf discoloration?

Hi folks, I’m a first time grower with 3 plants. I’m into roughly week 5 of this grow, and I’m seeing some discoloration in the leaves of one of the plants (actuaslly a little bit of dicoloration on the other 2 as well, but not as bad as the one plant).

Is this just the leaves starting to die naturally, or something off in my system? I’ve seen similar posts that indicate it might be a pH problem. Any help is appreciated! :grinning_face_with_smiling_eyes:

My system:

  • Strain: Gorilla Glue (got seeds from ILGM :))
  • Age: about 5 weeks (germinated 7/14)
  • Method: Miracle-Gro Potting Mix
  • Vessels: Fabric pots
  • Water is rain water from a barrel outside my house
  • PH of water: 6.4
  • TDS of Water: 12ppm
  • PH of nutrient solution: 6.28
  • TDS of nutrient solution: 1460ppm (assuming it’s that high because of the nutrients mixed in)
  • Method used to measure PH: PH Meter for Water Hydroponics Digital PH Tester Pen
  • Method used to measure TDS: HYQELEO TDS Meter Digital Water Tester
  • Indoor grow space: 48 x 48 x 80"
  • Light system: Advanced Platinum Series P300 300w 12-band LED Grow Light
  • Actual wattage draw of lights: 93W in VEG mode, 180W in BLOOM mode
  • Current Light Schedule: 4am - 10pm (18 hours)
  • Temps; Day, Night: 70’s, room temperature
  • Humidity; Day, Night: 50% ±5%
  • Ventilation system; Yes, No, Size : The grow tent has vents and ports that are opened, and I have an oscillating outdoor-function fan blowing 24 hours, but no active ventilation out of the tent.
  • AC: none, outside of the AC in my house
  • Humidifier: Mooka Humidifiers 2-in-1 Cool Mist Humidifier
  • De-humidifier: AUZKIN Dehumidifier 2200 Cubic Feet
  • Co2; Yes, No : Pretty sure no, at least not intentionally?.. haha

P.S. The pH listed above for the water is from a fresh can I just filled and adjusted. The last of the previous water can was 7.3 or something, so the pH is a bit higher than the 6.something I’ve read it should be.

Please let me know if you need more info. Thanks in advance!

  1. they’re really dark green and “waxy” which looks like TOO much nitrogen
  2. you are going to catch a lot of flack for the miracle grow soil and for good reason (TIME released nutes)
  3. following along to see what others chime in to say.

That looks like pest damage to be specific either spider mites or thrips id start searching for bugs if you don’t have the best of eye sight id recommend using a magnifying glass and look over the entire plant/plant’s

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Also like stated above your leafs are very dark green which means you are dealing with a nitrogen toxicity as well as miracle grow is loaded with nitrogen i believe and its also a hard soil for marijuana to grow in due to its slow release nutrients its not a ideal soil for pot plus you are also feeding it additional nutrients already ontop of whats already in the soil id recommend only feeding straight plain ph’d water for a bit


I concur. Looks like a unwanted pest munching on the leaves.

Miracle Gro tends to cause a lot of problems with each watering the plant is getting blasted. There is soils designed specifically for cannabis like Fox Farms soils.

FFOF is hot for the first 4 to 6 weeks and its good to go for future grows. Once depleted you can keep using the soil for other successful grows.

I use the same soil till its completely root bound and I start all over. I can usually make a bag of FFOF for over 2 years. Only catch is you start using nutrients as soon as it break soils since all the nutrients is used up.

If I had to use Miracle Gro, I would grow flowers in it till nutrients is gone. Then theoretically it shouldn’t cause no problems for future grows.

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Thanks for the heads-up on the miracle-gro, I’ll avoid that in the future. Do you think I should keep the plants in the miracle-gro, or would I be better off trying to transplant them into something more suitable, like the Fox Farms soil you had mentioned? I’ll stick with straight H2O in the meantime.

I’ve seen posts mentioning bugs, and I’ve looked around under the suspect leaves for signs of bugs (webs, eggs, actual bugs etc.) but I don’t see anything out of the ordinary. I can see the brown/gray spots on the underside of the leaf a lot of times but nothing buggy looking. I had assumed bugs shouldn’t be an issue with an indoor grow (the bugs wouldn’t have access to the plants like they would with outdoor grows) - do bugs actually cause a lot of issues with indoor grow tents?

hi @Travis_Hill …welcome. I am first timer also. This forum is the only way I would have made it this far. I am too new to offer anything except the miracle grow is not for these and do u have an exhaust fan of any kind? may the grow be with you.

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I have an oscillating fan that has an “outdoor” setting, which just means it alternates between blowing soft, medium, hard, or not at all (I’m sure the plants are completely fooled :laughing:). The tent has a good 8-10 vents and ports that should allow decent airflow. But, no, I don’t have anything blowing the air directly out of the tent. I may have to rig something up once it starts getting stinky haha. Do you think the ventilation has something to do with the spots?

Yes bugs can be a issue inside and outside more often outside obviously but even if your outside doing yard work they can jump onto you then you bring them in or being at someone else’s grow that has them then you bring them home there are multiple ways for them to find your plants they can also be hard to spot best time to check imo is rite before lights come on or rite after check over the entire plant and what size fabric pot are you in currently?

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I learned so much here. I have same size tent as you… my list of mistakes. too many plants in such small area. I am in WNY humidity was way high had to buy dehumidifier. a crappy ph meter, bought better one. I think they may tell u to get some exhaust for better circulation. this is just the first few boo boos I made. I don’t know much out the leaves, but this sight has pest and nutrient threads. I am sorry I can’t help much

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Any information is more than I had before - I def appreciate your input @beachglass!

@The1stTimer I’ll take a look tonight after the lights go out for bugs again. I have 5 gallon Vivosun pots (not sure brand makes a difference, but that’s what they are).

I would transplant them as they are not flowered nor to big. I have had no bugs indoors. Now flies its different because they come in when we have no rain. So I buy the Repel hanging trap at Walmart. They are located in the Hiking and camping section. I think they are $1.97.

Great fly catcher. Best I have ever seen.


Like @MrPeat said id also recommend transplanting them into some Fox Farms soil and bo the brand dosnt mater

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Thanks, I have some Fox Farms Ocean Forest scheduled to arrive Sunday. I also have some neem oil coming Saturday, so hopefully that should take care of any pest issues.

I appreciate all the help everyone! :grinning: Next question (of course there’s another one haha): do you guys know of a guide to transplanting? This will also be my first time transplanting plants. If this were a story, my character development would be OFF the CHARTS with all this knowledge :crazy_face:

J/k haha.

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Just go on YouTube and look it up fyi fabric pots are not fun transplanting out of i would also recommend getting some mycorrhizae to help with that transplanting stress plus its all beneficial for the plant you can some on amazon or at most local grow stores i use Bigfoot mycorrhizae but there are plenty others out there that are awesome and its prety affordable

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Does anyone know what this is on my seedlings and how to get rid of it? As you can see there are some kind of dots and clear color that seems like all over the leaves. Can someone please help me take care of these babies?

Did you check for pests yet, as suggested in your other post on this subject?

Can you get a clear close up of the damage?

I see different bigfoot mycorrhizae products - it looks like the granular type is “For new plants and transplants” - is the granular type the kind you had in mind? I’d never heard of mycorrhizae before this, but I’m ordering some now after googling it a bit. Thanks for the tip :smiley:

I use the granular and the gold dust the granular is more for direct contact to root applications and the gold is more or a soil drench you mix it with water and give to the soil typically the soil drench is for after you have already applied the granular to the roots its to help build the fungi colony and add more microbes note also tho that it takes about 4 weeks for the colonies to form and grow but they are extremely beneficial to plant growth


Ok, I got the FFOF soil and some myco in earlier than I expected, so I just finished transplanting today:

I guess it looks about the same (pretty sad), but hopefully they should grow a bit better. I got the neem oil today as well, and I’ll probably spray n pray the plants after this post…just needed a break. I’ve read so much about transplant stress that it’s stressing ME out lol. Time for a smoke. I may need attendee’s for the funeral for these girls tomorrow.