My leaves are curling up

[HTIM]

Hi can someone please tell me is this a pH issue or heat stress or something else??

 

[Phyto]

Without knowing more about your grow, at first blush, looks like light/heat stress.

 

[GNick55]

why?
could be a few things
temp,humidity?
what’s your growing medium?
size of pots?
watering? how much how often?
check for pests?

 

[KG1]

Wind spot maybe?

 

[m8ty]

Soil looks dry what's the water schedule?

 

[ChupaRain]

I had this happen with too much heat and not enough air movement—trimmed some lower leaves, raised the lights a bit, and added a small fan. Fixed the curl in days.

 

[ChupaRain]

I had this happen with too much heat and not enough air movement—trimmed some lower leaves, raised the lights a bit, and added a small fan. Fixed the curl in days.

I had a similar thing happen with leaves curling, and it turned out to be heat stress mixed with overfeeding. Once I backed off the nutes and improved airflow, things bounced back. I’ve been running a few strains from https://2fast4buds.com that seemed more forgiving with temp swings, which helped a ton in my setup. Also, make sure your pH isn’t drifting too much—it can sneak up on you.