Some leaves curling in...WTF?

jcommerce

Well-Known Member
Growth is explosive, but some of the leaves have become shiny and are curling inward as you'll see in the pics below. Quick info. about setup:

250 Watt HPS approx. 15 inches above growth
Air temps high 70s - low 80s
Humidity 45%
TDS Mid 600s
Ph 5.75
Botanicare Nutes

I can't figure out why these leaves are doing this.....
 

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lovethegreen

Well-Known Member
It looks a lot like over heating to me. I had a fan go out in my grow room,and all my leafs looked like that one on the end. They all recovered. You said your temps were in the 60's that shouldn't be a problem...
 

jcommerce

Well-Known Member
That would make sense as the doors were closed for 2.5 days straight while I was out of town for Thanksgiving. Max temps reached 84 F according to my digital themometer/hygrometer. Do you think, however, that this is an extreme enough of a temp to cause overheating stress?
 

WrldWidRadio911

Well-Known Member
My twins are a rich dark green, leaf tips curled in.... too much Nitrog. after a week of straight PH,d H20 they've straightened out

Although those leaves do not look like mine did, my leaf sides were flat with tips undercurling...
 

crazy-mental

Well-Known Member
try to find a way to expel the hot air. i try to stay 70/80. how old are your plants. they seem a little hot friend.
 

Weedhound

Well-Known Member
I agree with whoever said overnute problem if ph is normal (5.7 is perfect if you've been keeping it stable.) 84 degrees isn't going to do that to your plants unless you put something on them like an antifungal or spray or something and didn't pull back your lights. I'm guessing overnute.... pretty good one too.
 

jcommerce

Well-Known Member
Even with PPMs being in the 500s??? I've had several people p.m. me saying that they've never overnuted with Botaincare, even at full strength and I've been running at about 1/4 - 1/3 strength....

Sigh.....
 

Gygax1974

Just some idiot
What area of the plant are those leaves coming from? How hot is your res. water, hydro right? And how old are the plants and have you flushed them at all?
 

jcommerce

Well-Known Member
Deformed leaves are randomly all over. There will be several good ones, then a deformed one in the middle. No rhyme, reason, or obvious pattern. Plants are 3 weeks old, water res temp is low - mid 70s. Flushed last week with Clearex (have been changing res every week and plan is to flush with Clearex every other week).
 

Gygax1974

Just some idiot
Fan inside the room? And is any of the light reflecting off the top of the res. and hitting the underside of the leaves? Man you have some tough problems...lol.
 

Gygax1974

Just some idiot
OK explain your ventilation to us...I see a fan on the light any air circulating through the grow area?
 

jcommerce

Well-Known Member
Fan inside the room? And is any of the light reflecting off the top of the res. and hitting the underside of the leaves? Man you have some tough problems...lol.
Sigh, I know. There is a 67 CFM exhaust fan (case fan) at the top of the box with a duct line running to the cool glass connector on the reflector/hood. There is also a 30 CFM intake fan (case fan) pulling outside air (70 F approx.) in as well as a dozen or so 1 inch drill holes at the rear, bottom corner.

I would say that the 67 CFM exhaust is closer to 45 CFM due to the length of the duct lines and the carbon filter it pulls through. However, the box itself is about 29 cubic feet, so the total air exchange should still be about 1.5 times the size of the space per minute.
 

Gygax1974

Just some idiot
ok just wanted to make sure, when I do a SOG or SCROG i like to run some air through the bottom too, but I don't think this is the problem. Damn this is a tough one, maybe it is overnuted, just seems hard to do with such low feedings and good nutes....
 

jcommerce

Well-Known Member
Well, the box had been continually running in the 75 high / 68 low range for its first 2.5 weeks as I generally left the doors cracked open and had an additional fan blowing outside air in. However, when I went out of town for Thanksgiving, I left the doors closed and it looks like it was peaking and maintaining 84 - 86 F during the 3 days I was gone. This could have shocked the plants I guess as it was 10 degrees hotter than they were used to. My question is, how have I been able to have outdoor plants do fine, even with Summer highs reaching 105 F?

I'm with you though Gygax, hard to believe it's over nute....
 

Gygax1974

Just some idiot
The comparison to outdoor and indoor can't be made. I know what you mean by temperature changes outdoors but outdoor plants are far hardier than indoor, and they adapt quicker being used to the elements and what not. Maybe the two day with higher temps and not as much quality fresh air did stress them a bit. They look good for the most part, good luck.
 
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