Yellow leafs problem

Continuing the discussion from Leaf diagnosis for new grower:

First time grower. My plants are about 3 weeks old and they turning yellow on the edges. Please can anyone help me to diagnose the problem. I don’t know how to download the pictures yet, but any advice will be appreciated.

When you go to reply there’s a button that says upload pick your picture wait for it to download 100 percent then reply a picture will help tremendously sounds like nutrient burn possibly

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@kaliboss it helps if you have a photo under natural lighting to help make a diagnosis of your plant. If you could fill out a help ticket so we understand your growing conditions? We want to help, but we can’t with out up to date information.


Such as If it’s hydroponic if it’s medium what kind of medium (soil) & the lights you are using all that information will be very helpful

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How do I fill out the help ticket?

@kaliboss just fill out this information the best you can
Strain; bag seed etc

Soil in pots or hydro

PH of runoff or solution in reservoir?

What is strength of nutrient mix?


Light system, size?

Temps; Day,


Ventilation system;

AC, Humidifier, De-humidifier,


White Widow Autoflower
Soil in 5G pots
PH- around 6. But I have to say I fixed the Ph level recently
a few days ago. It was 7,6 before.
2x 45W led lights
Temp- 75F
Humidity: Don’t have the meter yet
Vent System: Through the wall exhaust fan and I have a 1/12" pvc pipe into the room for co2.
I still can’t figure it out to download the pictures

Lower right of the response box it says upload. Then choose a picture. @kaliboss
support ticket @Hogmaster

@kaliboss I would say it’s nutrient burn with out a picture. Just water no nutrients for another week possibly two, and see how she turns out.

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Sorry it took me so long. I had to update my computer. But thank you for your advice.

Closer picture in natural light would really help

Sorry, @kaliboss read previous post

@kaliboss natural lighting is best. But making an educated guess from the purple pictures, it’s nutrient burn. Just water for a week, and start again slowly, see how they respond.


Welcome to the ILGM Forums @kaliboss

What brand and type of soil?

Those 5 gallon buckets have got lots of holes in them for air and drainage?

How old are they and how long have they been in that growing medium?

how are you measuring / fixing your pH?

Was is NPK 16-4-8? Brand name and type. How often are you giving them and in what manner?

Hey Bob,
Each bucket has a six 1/2" holes on the bottom.
They are 3 weeks old and they’re like this I would say for more than a week.
I have a digital Ph meter.
I bought the fertilizer from Amazon
N as a nitrogen 16%
P as a Phosphate (P2O5) 4%
K as a Potassium (K2O) 8%
Here is my problem. The leafs started turning yellow before I gave them any nutrient. I’m using a moisture control potting mix from Miracle-gro and they’re saying it could feed up to six months. I started using a fertilizer NPK-16-4-8 after the yellow shows up, but that didn’t help eighter.
Am doing a lot of research lately and guessing a heat stress?
Here is why. My grow room is in the middle of the storage room and that room is not heated, so every time I open the grow room, the temperature drop at least 15 degrees, because it’s really cold outside these days.
The other thing my thermometer was close to the floor and when I raised the meter a couple of feet, the temperature was suddenly over eighty degrees.
Also, I didn’t have any fan inside. I add the fan only a few days ago.
Do you think that cost could be from a heat stress?
Any thoughts will be appreciated. Otherwise, I’m lost.

PH (WAS) way out. Residual PH imbalance will take 2 weeks to clear up-as long as you don’t let go out of range again. But your pots are too big (too late now?); the bigger the pot the longer it takes to clear the PH imbalance. Go to emergency DI water and monitor PH before starting nutes (slowly) again. Your harvest will be postponed proportionately. Just don’t pull them out or give up and let them die, though. Work them back to health…


I would never pull them out. I’m getting up in the midddle of night and trying to figure it out whats wrong with my babies :-). If its a ph level, I’ll keep an eye on it like a hawk from now on. Well its a first time indoor experience, so I know I’m making a lot of mistakes, but I belive I’ll get better. Thanks everybody to helping me out with my new hobby.

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1.) your Support TicketCopy/Paste: This “Support Ticket” Into Your Forum Post.
Answer These Simple Questions The Best You Can.
If You Do Not Know, Or Do Not Use Something; Just Say So = Na

Strain; Type, Bag Seed, Or Na

Soil In Pots, Hydroponic, Or Coco?

System Type?

Ph Of Runoff Or Solution In Reservoir?

What Is Strength Of Nutrient Mix? Ec, Or Tds

Indoor Or Outdoor

Light System, Size?

Temps; Day, Night

Humidity; Day, Night

Ventilation System; Yes, No, Size

Ac, Humidifier, De-humidifier,

Co2; Yes, No

Add Anything Else You Feel Would Help Us Give You A Most Informed Answer. Feel Free To Elaborate, But Short, To The

Questions And Facts Will Help Us Help You 


Here is a pic of Nutrient Burn


Nutrient Burn causes leaf tips to appear yellow or burnt. They can also be brown and twisted and crispy looking. Depending on the severity it can show many different symptoms and shows on lower part of the plant when its young, at older stages it can move anywhere on the plant.

To fix the problem when you have Nutrient burn, you want to flush out the plants with lots of water.


Soil should be flushed with lots of water, Use 3 gallons of water per one gallon of soil. Flush very thoroughly, after plant recovers usually after a week, you can resume using nutrients after a week or a week 1/2. When you flush your soil, you flush everything out, a lot of nutrients go with it, including the soil nutrients.