Thin, Narrow, Curled leaves problem, help please!

Hi!

A lot of new leaves (from 2 different strains) are rolled up (like a joint) and very thin. Please tell me what this could be!

250W HPS, in soil, 2nd week flowering, PH is 6.3 - 6.4











thanks guys!!

-Max

Temps? They could be freezing during sleep hours...

Hi ricky,

lowest is 21C (maybe occasionally 20C), highest is 24C, humidity 45-55

thanks

Leaves curling downward are often a sign of too much fertilizer. That leaf in the bottom picture looks like it has a pretty bad case of Nitrogen claw. I also see what could be some burnt leaf tips. Are some of the leaves leathery and dark green? If so, probably over-feeding. How much food are you giving your plants when you water? How often are you watering? Might be time for a flush...

Hi guys,

I think they were too close to the lamp or in a hotspot next to the reflective coating of the growbox. Problem disappeared when I moved the light further up.

jnonymous: One other plant of mine has really bad Nitrogen claw.. I flushed (for 30 mins.. water runoff was crystal clear) and then 4 days later the bottom leaves started turning yellow (no nutes)? I hope I can save her...

Thanks for all the help!

-Max