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If it helps, all of the brown spots were occurring only at the top of the two apical branches

These are the most recent pics. I know the plant is cramped in the tent but this late into flower I didn't want to do anymore defoliation

No I don't see any white on the plant, but it looks like Downey mildew can cause brown spots. But they don't seem to have a moldy or dusty texture so I don't believe it's mildew

I dont think it's powdery mildew at all. If anything Downey mildew

To me, the brown spots def look like calcium deficiency and I'm also noticing the edges of the leaves curling which is indicative of calcium deficiency. And considering my run off EC and PH of my feed solution have been perfect I dont think it's lockout. I'm removing affected leaves, upping...

My PUR filter tends to reduce ppm by about 100 or so typically. And my run off EC has typically been within the 300ppm range of my feed solution. Any my ph has typically been above 6.0. That's why I thought it must actually be a deficiency rather than a lockout of any kind. Following the feed...

I am using the "aggressive strength" feeding chart and up until now its been lush and growing like a sob. I can try flushing and feeding with a lower EC. So would high EC cause lockout and thus a deficiency?

The bottle says you can use it for hydro, soil, and coco. I'm not sure what a&b is

So you think it's nutrient burn?

I use tap that's been through a PUR filter. And I'm following the gh flora feeding chart Micro 4.7ml Gro 4.7 ml Bloom 5.7 ml

I always feed it ph between 5.8 - 6.2

Correct

I'm feeding it at 1.3 -1.5 and run off has been around 1.5

Yes. I water twice a day with a large amount of run off

I wasn't paying close enough attention and barely noticed this on many of my leaves. I'm in week 6 of flower and have had smooth sailing until now. I'm leaning towards calcium deficiency. I use coco and supplement with 2.5ml a gallon of calmag. Other than that I'm using the gh flora series

I use tap water and I grow in coco. Should I worry about dechlorinating my water if I use microbe brew? Should I dechlorinate all my water to keep microbe life alive in the root zone? If it helps I'm using GH Flora series as well. Thank you!

Starting EC is 270. And Billy the mountain, I'm growing in coco. My understanding was calmag was pretty important when growing with coco

Are the ec recommendations on the flora series 3 part feed chart before or after adding cal mag? The recommended dose of cal mag already puts the ec at .8 when the recommended seedling ec is at .5 so once the nutrients are all prepared most of the ec is because of the cal mag and I'm afraid they...

I'm growing in coco. The usual EC im giving them right now is about 1600. The run off has been high, about 2200 EC. Could that be related to possible over feeding? Should I fertigate more or lower my feed EC?

I switched to 12/12 63 days ago and flowering began about 40 days ago. I think stretching finally stopped but the buds have been like this for multiple weeks and aren't seeming to grow or become more dense. More flowering sites still seem to be forming and trichomes are forming, but I figured at...