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back to front necrosis on leaf

thiccstems

New member
https://www.icmag.com/ic/picture.php?albumid=85541&pictureid=2118384
These are about 1.5 months in from seed. I run canna coco in fabric pots drain to waste with a pump and res.

First couple of weeks I just gave them hand watered tap water, after that did 400ppm nutes (my tap is 100ppm + 300ppm of floragro) for a couple weeks, but was lazy and didn't pH it, but no problems.

At 1 month, I switched nutes to my 100ppm tap + 600ppm of 6:9 ratio floramicro and florabloom. This time I did check pH and had to add a little pH adjustment to get it to 6.0. It's drifted up to 6.1 in the res as of now, but pH has been stable and I've been calibrating my meters.

The problems started appearing around the time of this nute switch.

I keep looking in the sick plant guides, but I don't find anything that's looking like what's going on in the pic with the back to front yellowing and necrosis of the leaf. The stems all turned really red on those leaves as well. The rest of the plant started getting weird leaf dimples and twisted growth.. it seems better now, but everything still has this droopy look to it and the lower leaves are burning more everyday.

Not sure what to do? Should I flush? Is this a deficiency? I swear my pH is right, but it looks like pH issues? Any help is very appreciated!

Thanks
 

TanzanianMagic

Well-known member
Veteran
https://www.icmag.com/ic/picture.php?albumid=85541&pictureid=2118384
These are about 1.5 months in from seed. I run canna coco in fabric pots drain to waste with a pump and res.

First couple of weeks I just gave them hand watered tap water, after that did 400ppm nutes (my tap is 100ppm + 300ppm of floragro) for a couple weeks, but was lazy and didn't pH it, but no problems.

At 1 month, I switched nutes to my 100ppm tap + 600ppm of 6:9 ratio floramicro and florabloom. This time I did check pH and had to add a little pH adjustment to get it to 6.0. It's drifted up to 6.1 in the res as of now, but pH has been stable and I've been calibrating my meters.

The problems started appearing around the time of this nute switch.

I keep looking in the sick plant guides, but I don't find anything that's looking like what's going on in the pic with the back to front yellowing and necrosis of the leaf. The stems all turned really red on those leaves as well. The rest of the plant started getting weird leaf dimples and twisted growth.. it seems better now, but everything still has this droopy look to it and the lower leaves are burning more everyday.

Not sure what to do? Should I flush? Is this a deficiency? I swear my pH is right, but it looks like pH issues? Any help is very appreciated!

Thanks
I think the plant liked the higher pH. PH issues are also evidenced by the curling leaves of the tops.

Also, 100 PPM or 0.2 EC is almost soft water.

Also the higher nutrient concentration could push the pH lower, especially in relatively soft low calcium water that has no buffering capacity.

GHE has a specific soft water nutrient line.
 

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