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da1316

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Mar 16, 2025

#1

New to growing this is a granddaddy purple autoflower. I use general hydroponics for my nutrients and grow in a coco coir/perlite mix. Vivosun 2x4 grow tent kit 20 hrs on 4 hrs off. Plant was growing well until around week 6 or 7. Around week 6 or 7 leaves started to show problems with spots. I did a flush each week since thinking it was nutrient burn but it seems to be getting worse. I check the ph and its usually always around 6.5. I'm not sure what is going on and what else to do. Any help is appreciated. Please see photos.

 

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Grownsince95

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#2

Looks like a severe Ca issue...

What's the ppm of your feed?

Are you using RO water or tap?

In what order are you mixing your GH line?

 

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da1316

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#3

Not sure of the ppm and use filtered well water.

I mix in this order
Cal-mag
Flora-micro
Flora-grow
Flora-bloom

 

carlosescobar

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#4

That is led light burn, the light is too bright or too close ..i bet it started off with yellowing leaves because the first thing it does is stop taking up potassium. then the leaves have even less protection and start burning.

 

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Grownsince95

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#5

Have you ever checked the well water ppm? You could be overdosing the cal/mag which will block the potassium uptake.

When using well water I always recommend measuring TDS before using cal/mag. It's likely to already contain high levels of both.

You can definitely dim or raise the light to lower stress on the plant for now but I sense there's something more going on here.

 

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da1316

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#6

No I have not checked the ppm need a new meter. Will be ordering a new one. I did lower the lights hoping it helps. Should I skip the cal-mag for a few waterings?

 

KushToker

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#7

It doesn’t like being inside anymore imo…

 

Grownsince95

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#8

da1316 said:

No I have not checked the ppm need a new meter. Will be ordering a new one. I did lower the lights hoping it helps. Should I skip the cal-mag for a few waterings?

Click to expand...

Yeah I would. Well water can be tricky.