Some of my leaves are cupping

First off let me start by saying this is my first grow. I have a 24”x24”x36” tent with a 300w mars hydro light. I used fox farm soil. I also have the fox farm trio. I weigh my plant before watering to see the weight an weigh it again after I water to give me an idea of when I need to water again. A few of my top leaves are folding upwards an I don’t know why. Like I said this is my first grow so please don’t nail me to the cross for not knowing lol. Any helpful tips???

I forgot to mention that light is 24 1/2 inches above the plant

I don't use led lights but when mine cup it's usually too hot... heat stress. Mine do that in the hot desert sun too. That's why I don't grow outside. Other than that she looks good.

Thank you. So I should pull my lights back some? The temps don’t go over 77.

Back off the light a bit for a while, that is the first signs of tacoing. What is the temperature and humidity in there?

Other than the ghastly purple colour your plant looks fine.

That plant is just praying to the light and that's a good thing. When it's heat issues causing the "taco" look the jagged edges of the leaves will be curled in a bit and I'm not seeing that.

You got the first baby jitters man. I hope you're not feeding it nutes yet. That FF soil has plenty of nutes until that plant is way bigger and about ready to flower. Giving it nutes now will likely cause serious burn.

ANC said:

Back off the light a bit for a while, that is the first signs of tacoing. What is the temperature and humidity in there?

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The temps are usually around 75 an humidity around like 35

OldMedUser said:

Other than the ghastly purple colour your plant looks fine.

That plant is just praying to the light and that's a good thing. When it's heat issues causing the "taco" look the jagged edges of the leaves will be curled in a bit and I'm not seeing that.

You got the first baby jitters man. I hope you're not feeding it nutes yet. That FF soil has plenty of nutes until that plant is way bigger and about ready to flower. Giving it nutes now will likely cause serious burn.

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I

OldMedUser said:

Other than the ghastly purple colour your plant looks fine.

That plant is just praying to the light and that's a good thing. When it's heat issues causing the "taco" look the jagged edges of the leaves will be curled in a bit and I'm not seeing that.

You got the first baby jitters man. I hope you're not feeding it nutes yet. That FF soil has plenty of nutes until that plant is way bigger and about ready to flower. Giving it nutes now will likely cause serious burn.

Click to expand...

Thanks for that info. An sorry bout the purple light probably should have cut that off before I took the pic. Lol

Temp is fine but with that lower RH it's easy for plants to burn as they are drawing up more water than they should which means they store extra salts in their leaves which leads to toxic salts buildup that can be worsened by minerals in tap water.

The extra transpiration easily explains the "praying" of the leaves as my RH is always low and my plants do that all the time but with lower levels of nutes I prevented the usual crispy leaves of grows past in my last grow.

OldMedUser said:

Temp is fine but with that lower RH it's easy for plants to burn as they are drawing up more water than they should which means they store extra salts in their leaves which leads to toxic salts buildup that can be worsened by minerals in tap water.

The extra transpiration easily explains the "praying" of the leaves as my RH is always low and my plants do that all the time but with lower levels of nutes I prevented the usual crispy leaves of grows past in my last grow.

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So should I try to get the humidity up?

Shy-man said:

So should I try to get the humidity up?

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With a small space like yours it's easy enough to do and would help. Could be as simple as a tray of water sitting where the fan blows across it. Hanging a wet dis towel up and re-wetting as needed but you need to reduce how much your exhaust fan if you have one is on or the moisture just gets blown out and you never get the RH up. That's my problem so I'm opting for lower feed levels to prevent buildup. Easy for me as I use soilless to grow in pots or DWC so can control my nute levels. With the rich soil you are using there is already a lot of nutes present and you can't really do much about that now.

Problems with toxic salts buildup don't really show up until mid-flower tho you may see nute burn while still in late veg if the RH remains chronically low like mine is without adding humidity. I've had it bad and it wasn't until I clued in to Vapour Pressure Deficit that I finally figured out why I got crispy dying leaves around week 5 in flower. Sometimes so bad the tiny bud leaves were getting crispy at the end.

Here's a chart about the VPD and a link to lots of free pot books and other info.



I found a great spot to download FREE POT BOOKS. I downloaded a grow bible first and got lots more. Books look great and complete like the real ones I have here. No web site but just a page of links. Just right click on what you want and then "Save Link As" to download so they don't open first as some are 50+ megs. They got lots. Enjoy.

Good luck and good growing!