Transplanted from Root Riot --> Solo Cups and my babies look sick

That's enough roots for a sucessful repot. Don't mess with your soil PH, ph the water/nutes going in, that's all you need to do. The soil is buffered. Also, I don't see the yellowing, leaves are always lighter when they first appear, then darken as the chlorophyll matures.

Phytoplankton said:

That's enough roots for a sucessful repot. Don't mess with your soil PH, ph the water/nutes going in, that's all you need to do. The soil is buffered. Also, I don't see the yellowing, leaves are always lighter when they first appear, then darken as the chlorophyll matures.

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I didn't try to mess with soil PH at all. Just went ahead and did the repot and ph Down in the water and Recharge I added. I was wondering that though, so good to know that's not something I should ever have to mess with. I'm testing the water, nutrient solution, and runoff to get an idea of where the issue is and will continue to do so meticulously throughout the process now.

The yellowing I was mentioning is at the very tip of the finger in the top of the photo below. You can also see a little on the finger in the far right. It's also on the other side, but this angle didn't capture. Doesn't seem to be huge, but the one time I grew 15 years ago, PH caused nute lock and this is what it started looking like. I might just be over analyzing things, but I've never seen that in the vids I watch online.

Back again with another update and question for the group....

I noticed a few days ago the below spots starting to form on some of the lower foliage of my Blue Dream plant. 21 days old, RH between 62-67%, Temp 70-76, VPD 1.0-1.2. Up until yesterday I only given the plants water and some compost tea, but I ran the first batch of nutes yesterday afternoon. Plants were dropping a bit and I had noticed the below browning on the lower leaves. I was thinking this might be nute deficiency, so I went ahead and top dressed 2 tablespoons of Terp Tea Grow (7-1-1) to all plants yesterday. This was the smallest recommended dose and I also did a few teaspoons dissolved in water so the roots would get access to some of the nutes quicker.

Caveat, about a week and a half ago I noticed my water PH was going in too alkaline (around 8-8.5) but since I have watered and added nutes both PH'd down to 6.0-6.3. Not sure if the browning might be from that.

It doesn't seem to be on either of the two other strains, and this one was growing the quickest, which is what made me think it was nute deficiency and not something else. Not seeing any bugs, but admittedly just starting my IPM tomorrow with a good foliage spray. Am I over concerned here or is this a problem?

Not expert advice but possibly right.


basically your soil was very alkaline for a while and phosphorus is best absorbed under 6.2. Combine with a strong ph fluctuation, it could easily be this but check more bro

SpectacularG said:

Not expert advice but possibly right.

How to fix Cannabis Phosphorus Deficiency (P) Pics & Symptoms

Phosphorus deficiencies cause dark splotches on leaves and can appear at the bottom of the plant on some of the oldest leaves. Learn to spot & fix the issue.

www.growweedeasy.com

basically your soil was very alkaline for a while and phosphorus is best absorbed under 6.2. Combine with a strong ph fluctuation, it could easily be this but check more bro

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That's the best match to what I see on my plants. That part about it being on the bottom on some of the oldest leaves matches as well. I figured it was a result of the PH issue in some way. Hopefully adding the nutes in at a low dose yesterday will offset that a bit. I'll increase to the full recommended dose on the next go around depending on how they respond. My PH has been around 6.1 - 6.3 since the issue, so that should keep me close to your recommendation.

Off topic, but I'm starting an IPM tomorrow. I'm using 2 separate Omri rated foliage sprays (one neem oil and one rosemary based) and adding beneficial nematodes. I'll do this through veg, but I would rather not use a foliage spray during flower. Any recs for when I get there?

cccduncan said:

That's the best match to what I see on my plants. That part about it being on the bottom on some of the oldest leaves matches as well. I figured it was a result of the PH issue in some way. Hopefully adding the nutes in at a low dose yesterday will offset that a bit. I'll increase to the full recommended dose on the next go around depending on how they respond. My PH has been around 6.1 - 6.3 since the issue, so that should keep me close to your recommendation.

Off topic, but I'm starting an IPM tomorrow. I'm using 2 separate Omri rated foliage sprays (one neem oil and one rosemary based) and adding beneficial nematodes. I'll do this through veg, but I would rather not use a foliage spray during flower. Any recs for when I get there?

Click to expand...

45-55%rh you should be gucci.
Yeah glad you checked that out but something to remember is that deficiencies are caused by actual deficiencies of course but also the plant not being in the right ph range and therefore not being able to absorb the nutrient, so don't dump nutrients like crazy because you could easily have already enough phosphorus in the soil, just your plant can't absorb it.