Brown crinkly leaves starting from center.

Day 22 from sprout and my first large 3 fingered fan leaves are crinkling and turn brown from the center outwards.

Early on these leaves margins were drooping down, but now have started to warp and become hard feeling. My ph has been at a steady 5.9-6.0 and I am currently using the lucas formula of 2.5ml micro and 5ml bloom per gallon along with 3.75 ml per gallon of calimagic.

The roots are nice and white, and this started when the majority of the roots finally became submerged in the res.

According to the nutrient formula I'm using it says I should have increased this to 5ml/10ml micro/bloom per gallon by now. Does she need more food? Leaf tips are not yellow or burning.

Any suggestions would help.

When was the last time you calibrated your pH pen?

MickFoster said:

When was the last time you calibrated your pH pen?

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When I started this grow. I bought a brand new ph pen:


I also have a cheap $7 pen which gave me the exact same results.....

MickFoster said:

When was the last time you calibrated your pH pen?

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So I wanted to wait till I had to calibrate it to use the provided solutions, but I just finished.

My expensive pen was ~0.2 high. I didnt do the other pen, but it was only about 0.03 difference which made me think the price wasn't really justified. The high priced pen came with a dryish probe, probably lost some calibration.

That aside, my ph was probably any where from 6.1 and 6.2. Humidity is at 68%.

Jkooper said:

That aside, my ph was probably any where from 6.1 and 6.2.

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Too high for DWC.

MickFoster said:

Too high for DWC.

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Just dropped it to 5.83, I'll see how that goes.