Leaf curl (not due to heat)

Hello my fellow cultivators,

Recently I started some fat little indicas, so far 4" tall but 9" wide making them little bushes. The leaves on a few plants have their leaves curled up as you will see in the photos attached. The nutrients seem balanced, just this weird leaf curl that I can't relate to heat stress because my temp gauges say that its between 76-79 degrees Fahrenheit. Also, I have a overhead fan circulating air and a mini turbo fan directed between the lights and the plants, so I doubt if heat is a problem. Last harvest I grew the same strain and this same problem happened, but only happened during the first several weeks and slowly went away.

Now, I know I will get plenty of questions about media, temps etc...

-soil mix (45% compost, 45% sphagnum peat moss, 10% perlite)
pH~6.8-7.2
-temp ~75-80 F humidity (relative) ~45-60%
-three weeks from seed
-24/7 cycle
-Using two 150 watt high pressure sodium systems

I just gave it the first dose of fertilizer: 1/2 strength Age Old Organics (Grow)
as a sub note, my fertilizer is 5 years old. Is that too old?

Soil might be a little hot. Back your lights off another 6 inches. See what happens. Why you on 24 hr lights? Are these autos? If not back it to 18 on.

Da Mann said:

Soil might be a little hot. Back your lights off another 6 inches. See what happens. Why you on 24 hr lights? Are these autos? If not back it to 18 on.

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Thats 1 of 2 things either 2 hot or 2 windy man how close is the fan my grow is doing the same I thought heat I backed light of majorly didnt help then I turned my fan down and it was the fan

weedenhanced said:

Thats 1 of 2 things either 2 hot or 2 windy man how close is the fan my grow is doing the same I thought heat I backed light of majorly didnt help then I turned my fan down and it was the fan

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Got to start somewhere right Bro?

Da Mann said:

Got to start somewhere right Bro?

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Yeah man my plants r pumpin still if it only slight cupping I would not worry

Da Mann said:

Soil might be a little hot. Back your lights off another 6 inches. See what happens. Why you on 24 hr lights? Are these autos? If not back it to 18 on.

Click to expand...

I am on a 24/7 cycle for the first time since I started growing. I usually do a 18/6 cycle for veg, but due to a friend's encouragement I am trying the 24/7 cycle. My main goal is to flower these asap and take one for a mother plant (maybe two). He said that I would get plants to grow more quickly using a 24/7 cycle for veg, but I am skeptical. I feel that the sun goes up and down each day, so the light should be on and off, but we will see what happens.

weedenhanced said:

Thats 1 of 2 things either 2 hot or 2 windy man how close is the fan my grow is doing the same I thought heat I backed light of majorly didnt help then I turned my fan down and it was the fan

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The fan is point above the plants and below the lights to ventilate the heat accumulation. I will back off the fan and see what happens. Thanks.

MydogCody said:

I am on a 24/7 cycle for the first time since I started growing. I usually do a 18/6 cycle for veg, but due to a friend's encouragement I am trying the 24/7 cycle. My main goal is to flower these asap and take one for a mother plant (maybe two). He said that I would get plants to grow more quickly using a 24/7 cycle for veg, but I am skeptical. I feel that the sun goes up and down each day, so the light should be on and off, but we will see what happens.

Click to expand...

Id agree with some time for darkness 24/7 is hardcore

Photo plants need a dark period. You will get better growth with a period of dark. 24 hour on will stress the plants as well. That can cause a new set of problems.

I am glad to report that my leaf curl problem is no more. I raised the lights 6" and place the fan so the plants get indirect circulation. My temperatures have dropped into the low 70's. Most times that I read the thermometer the temp is between 70-75 degrees.