Leaf tips curling/folding, PICS!

Hi All,

About 3 weeks into flower the leaf tips began to curl down and the margin of the leaf began to fold in like a taco shell. I'm growing in rockwool slabs which I ph'd for 24 hours in 5.0 distilled water. I also use Canna nutes. I noticed my ppm runoff was very high and ph runoff is high as well (6. and I'm trying to correct this now by using ph 5.0 distilled water. I'm on day 3 of distilled water ph to 5.0 and the runoff is still 6.8 but ppm's are coming down. Turns out to be a lot harder than I imagined.

Questions: Is the leaf curling/folding due to the high ph/ppm's? Any better ideas to lower runoff ph? I'm thinking about running 4.5 but don't know if that will cause more problems. Let me know if you need more info.

Thanks,




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Looks like nitrogen deff, assuming those yellow leaves are at the bottom of the plant.

Welcome to the club!

Possibly a Mag. deficiency, I'd check the stickies if I were you...

fix ur ph water to 5.6 and flush ur rockwool from top down to remove excess salts than ph should be stable also 4 times res volume for amount that floods table makes for more stable ph due to volume increase also whats ur daily water cycle mine 5times day 3min times i use 380gph pumps (as soon ur table fills 30seconds after pumps off to drain whole cycle never longer 10min max if u r longer get new pump or add extra pump) n after salts removed u can get that def under control also 5.5 is correct ph for conditioning rockwool but that didnt cause this problem