Light burn or Nute burn?

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Tehkaordaplease

Member
Pics below

12 Days above soil -
Strain: Raindance (from Greenpoint) FFOF soil in solo cups. Watered 3 days ago with tap water - PH 7.0
Humidity is typically around 40%

They were under my HLG260W at about 1/3 power, 22 inches away. (With the HLG QB, temps rose to about 88 degrees and the next day I noticed first signs of problems) So I went back to CFLs for now and brought temps down.

Do you think the light/heat was too much for them? Or is it more of a nutrient problem? I havent given any nutrients yet but I hear FFOF can be a little hot for seedlings.

I have 5 seedlings total, only 2 of them are showing these signs.


Any advice is appreciated!






 
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CannaCountry

Well-Known Member
You changed your lighting; good job. Now just watch them over the next day or so. If it was the lighting, you won't see anymore of the issue. If it wasn't the lighting, the issue will persist and you can target your soil on being a bit too hot. Eliminate one variable at a time and you'll be fine.
 
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Blitz35

Well-Known Member
I would highly doubt that that is a lighting issue as the new growth is unaffected and the node underneath is burning, not even bleaching prior. I'd say that the soil is too hot and causing some leaf burn. Also, the cups seem very dry! My plants grew through 6 heat waves this summer with temps right at 90 or a shade above and none of the 4 strains i had showed an issue with heat at those temps.
 
hotrodharley

hotrodharley

Well-Known Member
Blitz35 said:
I would highly doubt that that is a lighting issue as the new growth is unaffected and the node underneath is burning, not even bleaching prior. I'd say that the soil is too hot and causing some leaf burn. Also, the cups seem very dry! My plants grew through 6 heat waves this summer with temps right at 90 or a shade above and none of the 4 strains i had showed an issue with heat at those temps.
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Agree
 
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Tehkaordaplease

Member
Blitz35 said:
I would highly doubt that that is a lighting issue as the new growth is unaffected and the node underneath is burning, not even bleaching prior. I'd say that the soil is too hot and causing some leaf burn. Also, the cups seem very dry! My plants grew through 6 heat waves this summer with temps right at 90 or a shade above and none of the 4 strains i had showed an issue with heat at those temps.
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So since its most likely the hot soil would you recommend watering like normal? The cups are pretty dry so theyre due for it. Im guessing ill hold off on adding nutrients for another few weeks?

Thanks for the reply!
 
Logan Burke

Logan Burke

Well-Known Member
I'm leaning towards too hot of soil for the baby...got some happy frog you could plant her in for the first week or so? Stuff is great for seedlings.
 
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Tehkaordaplease

Member
Logan Burke said:
I'm leaning towards too hot of soil for the baby...got some happy frog you could plant her in for the first week or so? Stuff is great for seedlings.
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Unfortunately I dont have any happy frog. Would you recommend using that instead of FFOF when i transplant into 3 gallon pots? Or should I just hope theyll pull through in the same soil?
 
Logan Burke

Logan Burke

Well-Known Member
I would recommend mixing/diluting the Ocean Forest with the Happy Frog. In a perfect world, I would start my seeds in happy frog, then move them into a mix of Happy Frog and OF after about 1-2 weeks, or whenever they start to yellow and act all hungry. Happy Frog isn't good for your mid and late veggy stages and beyond, it's just fantastic for starting. I would also mix in a nice bit of perlite...no less than 25% of the entire mix of soil. You can always add nutes...but taking them out, in soil, is far more difficult. If they don't get any worse, they will likely pull through fine in their solo cups. But if it keeps getting worse, at all, I would pull those babies up and throw them in pretty much any soil that isn't loaded with nutrients. And by no means should you ever use Miracle Grow soil...they have a 'Natures Care' line and it is ok, but their name brand soil is horrid for cannabis. Sorry for the ramblings...smoking gives me a motor mouth >.<
 
MichiganMedGrower

MichiganMedGrower

Well-Known Member
I use ocean forest from seed to harvest for years with no real soil related problems.

I don’t know what happened before now but the cups should be filled higher. I always fill the cups to the top once the seedling stretches a bit. You can go almost to the cots and all the buried stem will grow out roots.

For now I would gently water to saturate the cups and look for good runoff.

This should re set the pot and clear out some nutrients that may be blocking the new fragile roots.

When they look strong and are pretty dry again I would transplant up to fresh soil. I go plastic party cup to 1 gallon to 3 about every 2 weeks.
 
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Tehkaordaplease

Member
Thank you guys for your input.

I gave them some water and got good runoff, added a humidifier to bring up humidity a bit and ill see how they pull through. Ill be sure to add some perlite in the mix when I replant into gallon pots.

Do you think they would be better off with the QB as opposed to the CFLs? I switched back to CFLs thinking that it was too much light for them since theyre so young
 
MrGhettoGrower

MrGhettoGrower

Well-Known Member
Start your seeds in Sunshine Mix 4 is my favorite or Light Warrior till you have 3 sets of leaves then it's safe to put in to the ffof! Your plants are burnt from the ffof! You'll have to feed for a week or two till then low ppm nutes 1st week 250 ppms second week 450 ppm
 
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Tehkaordaplease

Member
MrGhettoGrower said:
Start your seeds in Sunshine Mix 4 is my favorite or Light Warrior till you have 3 sets of leaves then it's safe to put in to the ffof! Your plants are burnt from the ffof! You'll have to feed for a week or two till then low ppm nutes 1st week 250 ppms second week 450 ppm
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So I need to feed additional nutrients right now even though the plants are burnt from the ffof? Or am I misunderstanding.
 
SPLFreak808

SPLFreak808

Well-Known Member
Anytime i use solo cups under good lights i usually need to drop my room temp to prevent the cup/root-zone from heat saturation.

85f under even my qb would toast those roots in a week if the cup gets hot enough.
 
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