Marijuana leaf tip curling up and down and U-shaped tips.

Title is self explanatory. Any help or info on why this is happening is much appreciated. Please see pictures.

Check the ph of your soil. Curling tips usually indicates a ph issue in the soil, or with the water you feed them. Here is a chart for you.
View attachment 2118525

ph heat humidity could be a number of things overall a very healthy looking plant

uneducated best guess would be a heat issue bottom of the plant looks good however insignificant it may be somthing is going on with the top make sure your lights aren't too close get some air blowing on her

Could be a nutreinnt deficiany, In say maybe magnesium defiency, nothing that cant be sorted with a bit of epson salt .1/4 teaspoon to 1 litre water. Hope this helps.

Where to get plant grade epsom salt? The growers bible says not to use the pharmacy stuff.

pH being off is usually the culprit in this scenario

Here's the issue with just trying random things like epsom salts...let's say that your magnesium and calcium levels are fine...and if you aren't using RO water then they should be without adding anything...but anyway if you add more and that is not the problem, then you could end up locking out calcium or magnesium, or something else...so check the pH first...adding things can happen after you nail down what the issue is...

i have one of those soil testers that has the capsule powder add water and "shake and compare". not sure how accurate this is. i have the "add 3 drops and compare" pH test kit for water / nutrient solution. Im using RO / Ozonated water that is pH 6.5 and after adding nutients i always adjust pH accordingly. This purified water has no micronutrients, so I add cal mag+ .

It may be an abundance of your Cal Mag you add. How much are you using? I wanna say its a mg def if your ph is correct, but in all honesty she looks healthy, I wouldnt go crazy with the epsom salt. You can buy it at dollar general, rexall I think is the brand I use. Just mix it with warm water. Your lady looks like she only needs a small amount. If you add too much of anything, you can lock out other nutes. So you ALWAYS want to start out light with your feed when trying to diagnose a symptom. Here is another chart that should help if she starts to show other signs.
View attachment 2120819

yousername said:

Where to get plant grade epsom salt? The growers bible says not to use the pharmacy stuff.

Click to expand...

there's your problem
greg green is killing more plants
bible is an ironic title, doncha think?
read rollitup
use greg green to wipe your ass
get a fan on it
douse it with plain water till runnoff is 10-15 %
water with approximately 3 cups of water to 1 gallon of soil to achieve this result
if you are using bottled or treated water, add some calmag
if you are not, check the ph of your water
looks like you may have a mild lockout from either over nitrogen or ph imbalance
either e=is easily solved with plain water and patience
sometimes when my plants just look a little stressed, i give them 3 or 5 hours of darkness
they like a nap from time to time evidently
she's pretty
relax
she likes you

Thanks for the constuctive and positive feedback everybody.

great chart! thanks!