Yellowing issue on 2/4 indoor Blue Dreams

Indoor Growing
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Back again for some detective work and advice!

I’ve got 4 Blue Dreams growing right now and so far everything has been fairly uneventful, they are growing in organic soil, I’m used Gaia Green 4-4-4 for this mix.

The plants were LST’d and topped along the way and then added a trellis to create an even canopy and are on week 17 as I wanted to grow them taller than I have done before (always got scared of flowering stretch and ended up with belly-button sized plants)

I’ve got yellowing issues on the top right, and on the top left but less so. The front two are looking good still.

I did a slurry test and the soils ranges from about 7.1-7.3 between them.

I did a Runoff too before realising I was wasting my time (I grew sythentic before). For what it’s worth, that runoff ph ranged from 7.3-8 and Ppm is 3500 and above.

The light is 18" away, I did travel for a few weeks at the end of June and my FIL was looking after them like the legend that he is, but wasn’t PHing the water and that comes out the tap at 7.8 ish, although he did use my bubbler to dechlorinate so he’s learning.

Recently I’ve been adding a little unsulphured molasses into the water before feeding also.

I did do a heavy defoliate under the trellis recently and the bigger fan leaves above, so could have stressed them, also I had an a/c unit outside the tent up until a couple weeks ago when it needed to be used upstairs as the summer rolled in.

Tent temps are sitting at 31c/87.8f right now and humidity 65-70% = 1.2 kpa and I can’t do much to cool it without another air conditioner.

So where have I gone wrong, what do you think could be happening and how would you fix it?

Thanks in advance for your time and help, I thought they would almost be ready to flower once they got a bit taller until this started happening so I want them to be healthy before I flip them.

Lights are Spider Farmer SF4000 450 at about 80% and have an a/c infinity filter and fan inside the tent, extracting outside.

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As usual, tagging those who have helped before, I appreciate you all!

@beardless @Newt @MattyBear @Nicky @Hellraiser @Lacewing @Graysin @Robbtower1 @Nubie419plus1

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Just noticed from the photos that the bottom right is started to yellow too

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I’d say it’s time to up the nutes a bit. They just look a tad hungry.

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Thanks for the reply! Would a top dressing with the 4-4-4 do or should I look at making a tea?

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You definitely have yellowing between the veins up top indicating low magnesium. They need a good feed most likely and not the slow release 4 4 4. I would use the tea or liquid fert ASAP.

Looks like the tips were burnt from excessive nitrogen at one point but I’ve never grew one that I didn’t burn a few tips on.

I use a type of organic fertilizer also the Jobes citrus with the bugs. Good stuff but I have to add a spoonful weekly to pots or my feed gets low and yellowing starts.

All organic dry fertilizers I’ve used seem weak. I assumed they were like triple 8 from the feed store but evidently not. So I just feed more often to compensate.

Hold your hand over the top of your plant canopy touching the tallest leaf for thirty seconds and holler back and tell us if your hand felt uncomfortable after the 30 seconds.

Good luck and happy growing

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Thanks for the tag but im still learning myself so not going to make suggestions just here to try and learn. Apologize im no help to ya on this one but these guys are on top of their game as ya can see.

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Hey ole friend.
I would think you need to use some good liquid fertilizer diluted and below 7ph above 6 though. Honesty there are several that do great. I am using and liking ROOTs organic fertilizers.
Then 2nd i feel your temps either are or will stress your plants. Especially as the summer heats up more and more.

I think 2 folks said low Magnesium. Good chance i agree and a organic fertilizer will do the trick as long as the ph is good when applied. I believe if the ph is not correct they cannot absorb or use the magnesium?

Double check with a reference on my 6 to 7 ph before believing me. I didnt look it up. It is just what my water here in Hawaii is and mine do well.
All my best.
Ann

Any chance you are over watering?

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Tea plz.

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If your slurry test says 7.1 or 7.2 then your PH is to high to have efficient nutrient absorption.
3500 ppm run off is more then enough if anything its to hot, but it’s organic so it can run a little hot.

Your soil is currently full of nutrients that is holding a high PH charge.

So you’ll need to lower the PH by feeding something with a low PH.

You can speed this up by reducing the feeds PH to let’s say a PH of 5, feeding a bit and then re attempting a soil slurry sample. Repeat until soil samples are 6.5

Also do a tds test on the slurry sample.

Also adjust your light to the proper DLI

Read the first post

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I think you’re right on the PH stuff, will lower the pH on the next feeding and keep testing the soil.

Frankly you have given me a lot to study and think about with the light stuff, everytime I think I have things dialed in, there is always more to learn!

I will start testing the lights in there and build a chart!

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Build a chart? You don’t need to build a chart.

Just take DLI readings and compare to my chart.

Also no problem your welcome, we all start somewhere

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Chart the readings, journal whatever you want to call it just take notes of where it’s at to see where it should be, is what I meant.

I’ve tracked the kpa but I’ve never done any light testing with this spider farmer setup

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Gotcha, soon there will be an app. A member of the forums is almost done coding it and we have been helping develop it.
He’s done an amazing job.

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Love that! Community app that benefits everyone, I’ll download when it’s ready

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So the photone app you recommended has a DLI option now, not sure if that was the case when you made the post but I did the lux conversions first before i realised and it averaged around the same at 49.5 right now which is good according to the chart you shared.

Did a big watering before making this post so waiting for them to dry out a bit but will do a lower pH feeding next to try and shift that down a bit.

Starting to see more growth now that I added some liquid fertiliser from coast of maine, their squid concentrate was all I had alone with Alaska fish fertiliser which are 2-3-0 and 5-1-1, I have roots organic tea on the way to make sure they don’t go hungry again.

Also do any of you do foliar spraying because I never have?

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At first it wasn’t and option, but it became and option. However I provide the information so that people understand the core of what is happening, also some have dedicated meters and do not use their phones…

Foliar sprays generally cause more harm then good within an indoor environment due to high intensity lights

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Yeah i thought that with foliar sprays too, I figured they were doing it on their 12 hour cycle without lights to combat that.

As an update, I fed them with a 5.5 pH’d feed and then after a couple of days I slurried the soil again and it was reading at 6.5, saw new growth on the yellowed plants this morning too.

The DLI stuff has been really interesting to me, I also managed to get another a/c unit outside of the tent so now the highest temp is 27c/80.5f and VPD sits around 1.0 KPa.

I also have Roots Organic terp tea grow now so will be keeping an eye on the yellowing with that.

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I know I’m chiming in a little late, looks like lots of good advice so far. I don’t think anyone suggested adding beneficial microbes to your soil. Looks like you’re doing an organic soil.

Beneficial microbes help break down the organic nutrients in your soil (the gaia green 4-4-4). This makes the nutrients available for your plant to take from the soil. Microbes can also help keep the soil in balance, especially pH, and to minimize ‘bad’ microbes.

Microbial mass worked well for me, I’ve heard really good things about Recharge. There are other products too.

I use Gaia green as well. About once a week I also add in beneficial microbes (lactobacillus that I cultured), molasses, humic acid and fulvic acid. This weekly addition is meant to help make the nutrients available to the plant. I know this is very similar to Recharge, which is likely superior to my own mix.

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Hey Dan, never too late to share free advice so thanks for taking the time to do that, really appreciate this community!

You’re correct that I haven’t looked into adding microbes, the furthest I’ve gone there is adding blackstrap molasses to feed them sugars and help with the co2 production.

Yes I like doing the organic soil approach, this soul was reused from the last batch and I added more of the Gaia into it but didn’t let it cook, think that’s where I’ve gone wrong on this grow.

I’m very new so I’m learning new tips each time someone responds to me here so I really appreciate that.

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Re-amending for a second run, awesome! I’ve got a planter on my 4th run, same thing here. Definitely get some beneficial microbes in there!

I got some advice of for the Gaia green nutrients: for cannabis, better to top dress every two weeks with a smaller amount. For example if you are going to top dress once a month with a cup of All Purpose, instead amend with a half cup (or just over a half cup) every two weeks. Same amount overall, but the plants get a more constant and consistent nutrient source.

Quality compost or worm castings can also be a good source of beneficial microbes. You can add a layer to the top of your soil with either, then water as normal. The water helps bring the nutrients and microbes down into the rest of the soil.

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