Mid canopy leaf curl

[gumshoe]

Looking for advice on leaf curl on mid canopy....

feed- canna flores A+B and Canna booster....
light - 400w sodium
soil- jonh innes 3 mixed with perlight and clay balls
temp-72-81
hum-29-48

In 6in pots on trays with cappillery matting

Two strains of plant , one strain with leaf curl other has none. Same nutrient sorce used

[stinkyattic]

Two things strike me:
-Your humidity fluctuates wildly; 28% is very low and will definitely lead to symptoms like that.
-When you say clay balls, do you mean hydroton pebbles? Those aren't really going to do much for you in a soil mix. And you can shoot yourself in the foot with them, because they come from the factory at a pH that is too high for your plants- you'd want to soak and adjust them before exposing them to the plants. You might want to do a quick pH runoff check to make sure that's not contributing to your problem.

Low humidity is the big thing though. A tray or 2 of water in with them will help.

[Rusty Trichome]

Are you using all three Canna nutes at the same time, or are you just refering to what you have on hand?

[GreenLeaf420]

Are you using any foil Sprays?

I've noticed that if you hit them with to much the leaves have a tendency to open and curl. then just the basic over nute. The hydrotone can create a lot of problems invest in a lot of PH down

Good Luck GL420:jointsmile::jointsmile::jointsmile: