Leaves Curling down, but not due to N toxicity

Hello!

I have an outdoor 50-gallon purple punch clone in mid-flower right now. Over the last few days, the fan leaves have started to curl down in the manner that fan leave typically curl due to too much n. The leaves are not dark and shiny, in the way that n toxic plants tend to be. This cut of purple punch has been a staple of my indoor grow over the last 1-2 years (and I grew it outdoor last year in a 7gal pot) and I have never had this problem before. I know this cut well enough to be 100% sure this is not N toxicity (if anything the plant is slightly low on n for this stage of growth). So my question is, in general, does anyone know of any cannabis plant ailments that look like n toxicity but without the dark shiny leaves? It's dark out right now but I will post photos tomorrow.
 

Nutty sKunK

Well-Known Member
Hi Steve!

The only element I know which can cause the hooked shaped tip to the leaves that isn’t N is sulphur.

Any light yellowing on new growth?

Much easier to diagnose through pictures, upload when u can!
 

Hollatchaboy

Well-Known Member
Hello!

I have an outdoor 50-gallon purple punch clone in mid-flower right now. Over the last few days, the fan leaves have started to curl down in the manner that fan leave typically curl due to too much n. The leaves are not dark and shiny, in the way that n toxic plants tend to be. This cut of purple punch has been a staple of my indoor grow over the last 1-2 years (and I grew it outdoor last year in a 7gal pot) and I have never had this problem before. I know this cut well enough to be 100% sure this is not N toxicity (if anything the plant is slightly low on n for this stage of growth). So my question is, in general, does anyone know of any cannabis plant ailments that look like n toxicity but without the dark shiny leaves? It's dark out right now but I will post photos tomorrow.
Ph?
 
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