Hi, Chester here. First time personal grow and I am about 5 weeks in with 4 plants.

I started noticing that some of the leaves have yellow/lime green blotches on and I'm concerned beause it appears to be getting worse, albeit very slowly.
Plants still seem to be growing, but I just wondered if this is something I should be particularly concerned with?

My soil pH is 6.5-6.8 and I recently installed a dehumidifier as the room was showing 90+% humidity, although I am waiting on delivery of a more accurate hygrometer as my current one is still showing around 80% despite the dehumidifier being off (it is set to switch off between 55-65%).

I have some BioBizz grow nutrients which I had crudely mixed with some water and I'm wondering if this yellowing is because I over-did it? Anyway, I have stopped ALL nutrients for now until I can contain the problem.

I am using a 200w Envirolite (blue spectrum) and I also wondered if I had it too close to the plants and the yellowing was a sign of burning? Some, not all, of the leaves do have a little dry curl at the tips. I've since raised the light to a good 24-36 inch away from the plants.

Temperature is good in my room and, without supplemental heating, sits at between 24-27o and, at night, never dropping below 20-21o.

Am I perhaps overwatering?

Anyway, please find attached 2 pictures of the problem. Any advice would be greatly appreciated.

Also, whilst I'm seeking advice...how long now before I should be able to determine sex? And how long should I let these plants (Northern Lights) grow, in the vegetative period before swtiching to 12/12? I am currently providing them with 20/4.

Really appreciate the advice.
Chester Atkins
Nashville
chesteratkins Reviewed by chesteratkins on . yellow/lime blotches on leaves? Hi, Chester here. First time personal grow and I am about 5 weeks in with 4 plants. I started noticing that some of the leaves have yellow/lime green blotches on and I'm concerned beause it appears to be getting worse, albeit very slowly. Plants still seem to be growing, but I just wondered if this is something I should be particularly concerned with? My soil pH is 6.5-6.8 and I recently installed a dehumidifier as the room was showing 90+% humidity, although I am waiting on delivery of Rating: 5