Dark Green Leaves Curling Under, Day 40 of Flowering

Strain: Not sure, got clones from another grower. Looks like a blend, mostly Indica.

Method: LST SCROG Cabinet Grow

Cycle: Clones put straight into flower upon rooting.

Lighting: 4 x 150W HPS over about 16 sq. Ft of SCROG

Hydro System: Low pressure Aeroponics / NFT Hybrid using RO water

Nutrients: General Hydroponics Advanced Recirculating Program (using everything except for root shield) 2-hour Florakleen flush and tank change every 10 days.

Air Temp: 80F-85F

Res Temp: 70-75

Humidity: 40%-60%

pH: 5.8-6.0



First picture is with the lights off using a flash to show the true color. The others are with the HPS on.

Basically the leaves are extremely dark green and curling under a bit. The plants still seem healthy, but not quite as perky as I'd like. It looks like nitrogen toxicity, but I don't know how this is possible since I'm using the Aggressive bloom program which has hardly any nitrogen in it.

Any thoughts?

+rep of course to anyone who can help

Last bump to see if anyone can explain how I'm getting what looks like N toxicity when I'm giving it heavy bloom nutes that don't have a lot of N in them.

i think your doin okay man. its happened to me a couple times with different strains. check back in if you keep having issues or it gets worse. the plant might be getting ready to suck the leaves nutes out for finishing. count on harvest soon!!!

That's encouraging of you. Do you think the buds will fatten up some more during that process?

For anyone who's interested, I'm pretty sure I found out what this is. Apparently nutrient burn can look like this, even when there's not much Nitrogen in the mix. I'm doing an extensive flush and dropping down from aggressive bloom to normal bloom.