What's going on with these plants?

oilmaker68

oilmaker68

Well-Known Member
Hempowering said:
What are the yellow spots from?
Why are the leaves curling up?
Does the top shoot look a little odd?
Any advice would be so great and much appreciated.
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If they started flat then curled up (canoed/tacked) then it's heat stress. They are simply too warm. I noticed some light green patches between the veins on your leaves too. That could be a heat bleaching thing or a nitro defficiency. Hard to say.

Hoe close is your light and what type is it. Are you feeding them?
 
H

Hempowering

Member
oilmaker68 said:
If they started flat then curled up (canoed/tacked) then it's heat stress. They are simply too warm. I noticed some light green patches between the veins on your leaves too. That could be a heat bleaching thing or a nitro defficiency. Hard to say.

Hoe close is your light and what type is it. Are you feeding them?
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Here are more details, it is a 400 watt HPS in a cooltube dimmed to 275 watts due to intense summer heat, like right around 20" away.
It's around three weeks old and I fed it 1ml of biobizz grow a few days ago. Temperatures hit 89 degrees F during mid-day.

Thanks for the reply! It's my first time doing this :)
 
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J0hnnY♣Ch1mp0

J0hnnY♣Ch1mp0

Active Member
I agree it appears to be heat stress and by your previous post with it hitting 89 that is more than likely the case. What is your humidity at right now? You want it to be at least at 50% other wise your plant will drink and use up water and nutes far too fast and dry out. Try to get your temps down as well.
 
Pass it Around

Pass it Around

Well-Known Member
Heat stress imo, I would do anything you can to bring the temps down during the day.

For instance, freeze a milk gallon full of water and put a fan on it to blow into your intake or inside your room. Yeah it will only help for a short time but the temperatures will destroy everything good about the plant. I had Chernobyls going and they were so dank smelling your mouth would water. After the damn summer temps hit up to 100 I almost lost the whole crop and now it smells okay but nowhere near as good as it did. Made me sad...
 
H

Hempowering

Member
Pass it Around said:
Heat stress imo, I would do anything you can to bring the temps down during the day.

For instance, freeze a milk gallon full of water and put a fan on it to blow into your intake or inside your room. Yeah it will only help for a short time but the temperatures will destroy everything good about the plant. I had Chernobyls going and they were so dank smelling your mouth would water. After the damn summer temps hit up to 100 I almost lost the whole crop and now it smells okay but nowhere near as good as it did. Made me sad...
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The room temperature here is 84 degrees F, and 89 degrees F inside the tent during mid day.
I don't own an A/C, so cooling the air by any other means than circulation is not an option for me. I'll try putting a bunch of those plastic ice packs inside and see if maybe that will lower the temp at least by a little bit. It's worth a shot. Thanks for the input!
 
H

Hempowering

Member
J0hnnY♣Ch1mp0 said:
I agree it appears to be heat stress and by your previous post with it hitting 89 that is more than likely the case. What is your humidity at right now? You want it to be at least at 50% other wise your plant will drink and use up water and nutes far too fast and dry out. Try to get your temps down as well.
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The humidity stays pretty steadily at 48%-50%. Lowest it has gotten is 42%, and the highest 55%. Thank you for taking a look :)
 
oilmaker68

oilmaker68

Well-Known Member
When your plant is too hot it stops photosynthesis which is bad. I know some one who ran ducting from his refrigerator/freezer to keep air cool in his tent.

Ice packs in front of your fan will help.
 
H

Hempowering

Member
oilmaker68 said:
When your plant is too hot it stops photosynthesis which is bad. I know some one who ran ducting from his refrigerator/freezer to keep air cool in his tent.

Ice packs in front of your fan will help.
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I am ready to try this as soon as it starts getting too hot today. Thanks!
 
H

Hempowering

Member
J0hnnY♣Ch1mp0 said:
Found your heat problem.
You need a squirrel cage fan with at least 400cfm for that hps.
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Well, the one I have now already changes the air like 5x per minute. I think the temp of the apartment is the issue, as the temp in the grow is only ever 2 degrees higher than the room temp. I will try the trick with ice packs in front of the fan and hope that helps a bit. Thanks so much for the input, since I'm totally new I appreciate it so much having experienced people sharing their knowledge.
 
oilmaker68

oilmaker68

Well-Known Member
Hempowering said:
Well, the one I have now already changes the air like 5x per minute. I think the temp of the apartment is the issue, as the temp in the grow is only ever 2 degrees higher than the room temp. I will try the trick with ice packs in front of the fan and hope that helps a bit. Thanks so much for the input, since I'm totally new I appreciate it so much having experienced people sharing their knowledge.
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you're welcome bro......we're all learning with every grow..
 
cobyb

cobyb

Active Member
Could she also use dry ice (solid CO2) to reduce the temperature and provide higher CO2 levels?
 
oilmaker68

oilmaker68

Well-Known Member
You cold I suppose but it's my understanding that it drys the air out. I may be wrong.

Would also be limited by quantity and price for what you'd need?
 
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