Yellowing leaves…help!

Jmoney0523

Jmoney0523

Member
Everything was fine 2-3 days ago and I look today and notice a significant amount of leaves at the top of the canopy are turning yellowish and some purple in them. I backed off my light a few inches. But I have a Vivosun vs2000 led. I thought you could keep LED lights pretty close to the plant but I had it a couple inches away. I backed it off to about seven or 8 inches off the top of the canopy. I water every 2 to 3 days depending on how dry the soil is And I use the tps starter kit nutrients along with unsulphered blackstrap molasses. Using a 2x4 tent. Temp around 82 during the day low 70s at night. All organic soil with castings. Ph is normal. Using 7 gallon fabric pots. But like I said everything was fine a couple days ago. Any feedback would be greatly appreciated.
 

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SpectacularG

SpectacularG

Well-Known Member
Not an expert yet bro but at first glance doesn't look like its lightburn because if you had it for all grow that close you would have know way sooner if that would have been the problem. Write your feeding schedules and quantities, ec/ppm and ph so we can go from there. What we know so far is that the yellowing is on top so that exclude any mobile nutrients deficiencies like nitrogen since they would have shown from the bottom up. Some strains yellow early in flower but not really in that style. I'm boarding a plane lets start doing some research, you probably have an easy problem to fix
 
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SpectacularG

SpectacularG

Well-Known Member
This is the closest thing I could find on a first brief research.
Possible Zinc deficiency but lets keep looking.

www.growweedeasy.com

How to fix Cannabis Zinc Deficiency (Z) Pics & Symptoms

Problem: A cannabis zinc deficiency causes younger leaves to start yellowing in between the veins. Leaf tips get discolored and may start dying.
www.growweedeasy.com www.growweedeasy.com

Also send a few good quality closeup pics of the leaves for better analysis.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Jmoney0523 said:
Everything was fine 2-3 days ago and I look today and notice a significant amount of leaves at the top of the canopy are turning yellowish and some purple in them. I backed off my light a few inches. But I have a Vivosun vs2000 led. I thought you could keep LED lights pretty close to the plant but I had it a couple inches away. I backed it off to about seven or 8 inches off the top of the canopy. I water every 2 to 3 days depending on how dry the soil is And I use the tps starter kit nutrients along with unsulphered blackstrap molasses. Using a 2x4 tent. Temp around 82 during the day low 70s at night. All organic soil with castings. Ph is normal. Using 7 gallon fabric pots. But like I said everything was fine a couple days ago. Any feedback would be greatly appreciated.
Click to expand...
Looks like light bleaching. Here's from Vivosun at 12" in the center they are getting hit with 1797 PPFD that's a lot. I'd make sure the light was 18" or a little more but no closer. Hope that helps.
1717990839403.png
Picture from: https://www.vivosun.com/vivosun-vs2000-led-grow-light-200w-p68320123310964736-v58820960379612621
 
SpectacularG

SpectacularG

Well-Known Member
Bro you was blasting 2000ppfd xD no wonder they got sunburnt like me today at the lake. They'll be alright tho blisters go away eventually
 
Jmoney0523

Jmoney0523

Member
S

sessybudfarmer

Member
Good looking plant!

Have you tried Calmag ?

I started watering with Calmag every watering and it cleared up in about 3 days.

It was difficult for me to pin down yellowing leaves. I knew that leaves do turn yellow during flowering stage so its a normal plant process.
There are a few deficiencies that look similar, so I started with what seemed like the easiest fix before dumping more nutes on my plants.

Maybe back the light intensity down if you cant raise it


IMG-6605.jpg
 
curious2garden

curious2garden

Well-Known Mod
Staff member
sessybudfarmer said:
Good looking plant!

Have you tried Calmag ?

I started watering with Calmag every watering and it cleared up in about 3 days.

It was difficult for me to pin down yellowing leaves. I knew that leaves do turn yellow during flowering stage so its a normal plant process.
There are a few deficiencies that look similar, so I started with what seemed like the easiest fix before dumping more nutes on my plants.

Maybe back the light intensity down if you cant raise it


View attachment 5399029
Click to expand...
Dimming his light is a great idea.

A light meter would help him and I'd suggest the Photone app if he has an iPhone or a Photobio meter. It's accurate and a lot cheaper then the Apogee that agrees with it.


Calcium deficiency is round punctate orange or rust spots that begin around the top of your plant. Magnesium deficiency begins around the middle of the plant and appears as interveinal chlorosis. I don't see that. His PPFD explains his symptoms and if he can't lower the light he needs to dim it.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Jmoney0523 said:
Shit I dunno if I can make it go to 16 inches. I’m almost to the top of my tent lol. I’ll see in the morning
Click to expand...
Dim it, get the photone app if you have an iPhone or the Photobio meter I mentioned above. You want about 600 to 800 PPFD. I don't run any viparspectra lights mine are all HLG and a Hyphotonflux so I couldn't give you a distance measurement but I'd turn it down to 50% for a few days and then try 75%.

1718022842238.png
 
S

sessybudfarmer

Member
curious2garden said:
Calcium deficiency is round punctate orange or rust spots that begin around the top of your plant. Magnesium deficiency begins around the middle of the plant and appears as interveinal chlorosis. I don't see that. His PPFD explains his symptoms and if he can't lower the light he needs to dim it.
Click to expand...
Now I remember... THATS what caused me to use the Calmag, (yellowing started at the top) but it did help the entire plant.

How do I give a thumbs up on these comments ? I cant find the button.
 
S

sessybudfarmer

Member
got it! :D
came back to post this helpful link I found on another forum that shows pictures of deficiencies. Curious2Garden is on it!

www.420magazine.com

Cannabis Plant and Pest Problem Solver: Pictorial

Here is a ready reckoner for Cannabis plant and pest problems. It has been put together by a master grower. I have edited for content and added to as needed. I hope you learn from this treatise. I have been doing a lot of research on sick plants and also helping out others a lot on sick...
www.420magazine.com www.420magazine.com
 
K

Killa2raw209

Member
Jmoney0523 said:
Everything was fine 2-3 days ago and I look today and notice a significant amount of leaves at the top of the canopy are turning yellowish and some purple in them. I backed off my light a few inches. But I have a Vivosun vs2000 led. I thought you could keep LED lights pretty close to the plant but I had it a couple inches away. I backed it off to about seven or 8 inches off the top of the canopy. I water every 2 to 3 days depending on how dry the soil is And I use the tps starter kit nutrients along with unsulphered blackstrap molasses. Using a 2x4 tent. Temp around 82 during the day low 70s at night. All organic soil with castings. Ph is normal. Using 7 gallon fabric pots. But like I said everything was fine a couple days ago. Any feedback would be greatly appreciated.
Click to expand...
Organic prolly being the reason man it’s so hard to fully dial in the nutrients that way when I run a full line like lets say AN I don’t have no nutrient issues
 
Jmoney0523

Jmoney0523

Member
sessybudfarmer said:
Good looking plant!

Have you tried Calmag ?

I started watering with Calmag every watering and it cleared up in about 3 days.

It was difficult for me to pin down yellowing leaves. I knew that leaves do turn yellow during flowering stage so its a normal plant process.
There are a few deficiencies that look similar, so I started with what seemed like the easiest fix before dumping more nutes on my plants.

Maybe back the light intensity down if you cant raise it


View attachment 5399029
Click to expand...
Yes I use cal mag with every watering
 
Jmoney0523

Jmoney0523

Member
curious2garden said:
Dimming his light is a great idea.

A light meter would help him and I'd suggest the Photone app if he has an iPhone or a Photobio meter. It's accurate and a lot cheaper then the Apogee that agrees with it.


Calcium deficiency is round punctate orange or rust spots that begin around the top of your plant. Magnesium deficiency begins around the middle of the plant and appears as interveinal chlorosis. I don't see that. His PPFD explains his symptoms and if he can't lower the light he needs to dim it.
Click to expand...
I can dim it, I also raised it to about 8 inches. I could jump it to over 12 inches but there’s no in between because I’d have to take the pulleys off and attach the light to my top bar on the tent.
 
curious2garden

curious2garden

Well-Known Mod
Staff member
Jmoney0523 said:
I can dim it, I also raised it to about 8 inches. I could jump it to over 12 inches but there’s no in between because I’d have to take the pulleys off and attach the light to my top bar on the tent.
Click to expand...
As long as you can dim it you're golden. If you have an iPhone get the Photone app or a small hand held monitor so you know where your PPFD is. @Laughing Grass got a good, inexpensive one she relies on.
 
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