browning of upper leafs.

[tomcromp]

Hello attached is a pic of my upper leaf only the upper leafs are like this.
My 250w 8u cfl light is around 3-4" away could this be why? should i move it further away or could it be something else?

[PlainJane]

I don't know a lot about growing under fluorescents but I don't think it's the distance of the CFLs, people get those pretty close to their plants. Heat/Light stress tends to make the edges of the leaves curl upward.
Could it be fan burn? Air flow is good but sometimes plants get a bit pissy about having too much air (especially if it's hot hair) being blown too hard on them.

Here is a link (http://www.icmag.com/ic/showthread.php?t=11688) which is useful but before thinking it's a nutrient thing I would fill out the troubleshooting form (http://boards.cannabis.com/plant-problems/127058-troubleshooting-form-yay-you-know-you-wanted-one.html) to get better answers. Might help to get a photo of the whole plant too.

[cigarettes42]

fill out the troubleshooting form. what kinda water you giving it? is it bottled?

[justanotherbozo]

I don't know a lot about growing under fluorescents but I don't think it's the distance of the CFLs, people get those pretty close to their plants. Heat/Light stress tends to make the edges of the leaves curl upward.
Could it be fan burn? Air flow is good but sometimes plants get a bit pissy about having too much air (especially if it's hot hair) being blown too hard on them.

Here is a link (http://www.icmag.com/ic/showthread.php?t=11688) which is useful but before thinking it's a nutrient thing I would fill out the troubleshooting form (http://boards.cannabis.com/plant-problems/127058-troubleshooting-form-yay-you-know-you-wanted-one.html) to get better answers. Might help to get a photo of the whole plant too.


jane's right, that doesn't look like heat stress.

she's also right that you need to fill out that form that she so kinkly supplied
a link to. that will help the experts diagnose the problem.

[stinkyattic]

Potassium def/lockout.
Fill out form.