Deficiencies or Toxicity? Or just a pH problem.

Hello,

First time grower here. Having some troubles with my plant. I have spent hours and hours reading different sites on troubleshooting, but I would rather get some direct feedback.

She isn't that big because I learned about being root bound the hard way with a little clay planter and then learned about moisture stress the hard way as well. Anyway...

From what I can see it looks like a deficiency problem. The tops have been getting lighter. The only thing is, it started after I learned about pH. I tested my runoff (before the plant showed signs like this) and it measured at about 5.0 for soil. I tested my tap water and it was about 7.8. I pH balanced my water to 6.5 and flushed with about 3.5 galons of water. I added a few nutes and then the brown spots on the leaves started.

I have recently added some nutes at 550 ppm. I LST the plant and it is about a 18 inches tall at the moment.

I'm thinking my problem is that I am worried that the pH stabilization will cause nute problems and overall am worried about nute burn. Just looking for a few opinions. Also worried about the purple stems.

In one of the pictures, it is hard to see, but there is a top that has been sitting under another top. I pulled it to the side and it looks like the perfect colour and shape (albeit underdeveloped from being under everything).

Fertilizer: Grotek - Gro & Silicon
pH: 6.2-6.8
soil: Sea soil
watering: when it gets dry to about an inch
age: 5-6 weeks
Feeding: Not a lot so far
Lights: 255w LED
Temp: 75-80
Humidity: 50%

Refering to the third pic I had almost the exact problem early on with one of my blue mystics it was either cal mag or ph flux can't remember I went from filtered water that I had no idea the ph of to tap that has a 7.0 ph so I would say ph your run off if that's good try a light dose of calmag or maybe even salt build up from the "sea" soil did you do a pre flush similar to coco?

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I never did a preflush.

My runoff used be really low then I flushed a bunch of times and my runoff is about 0.5 ph lower than my water going in (I heard this is normal).

I might have to pick up some calmag, but the fert has just about everything in it unless there is just not enough.

SilentQ said:

I never did a preflush.

My runoff used be really low then I flushed a bunch of times and my runoff is about 0.5 ph lower than my water going in (I heard this is normal).

I might have to pick up some calmag, but the fert has just about everything in it unless there is just not enough.

Click to expand...

I should really learn to read I would say it is most likely from ph flux before you add anything keep a eye on newer growth not the top but above where thoes spots are if they don't spread upwards there is a good chance it was the wild flux of your ph

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They're hungry. For a few different things. Just give them a good balanced feeding.

Although I would check ph as you seem to have some tip burn as well as deficiencies.


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These soils these days are really hot. I tested some run off and it was 1,000 ppm

moisture stress is new. what do you mean? overwatering?

Moisture stress as in overwatering (I need to water a little less than normal because of the LEDs)
Humidity that is too high and the plant can't get rid of water easily.
Airflow under the canopy to move excess moisture from the plants.

I tested the runoff after my pH flush and it was sitting at the pH of the input water. Then I gave nutes.

Did another pH'd flush and it came in a little low, but I measured the run-off and got 250ppm (water is about 130). Then ran another gallon and got 178 ish. I think she is just starving...