Wtf is this?????

Merlin1147 said:

Clay based soil in a pot? What is the soil ph?

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How possibly could the roots breath in such an environment? I don't see any perlite or anything at all on that pic which would integrate air into that soil.

I'd guess at foliar spray burn. If conditions are right, semi-evaporated nutrient rich drips can collect on lower leaves and cause spots. I give all my plants a furious shaking after spraying on those windless days, but I rarely use anything but water from the hose, not as a foliar feed but as a bug smashing, plant strengthening torture type of fun. No spotting from rain or plain water

Kassiopeija said:

How possibly could the roots breath in such an environment? I don't see any perlite or anything at all on that pic which would integrate air into that soil.

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How do you think plants in 100% Coco are able to grow? Fully saturated Coco coir still holds 22% air. You just need to dry out the medium between waterings and don't overwater. Its just harder to overwater with added perlite and the plants get some extra oxygen.

Wastei said:

How do you think plants in 100% Coco grow? Fully saturated Coco coir still holds 22% air

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yes, I like Coco very much and always add appprox. 20% of it to my soil in order to make it more airy plus coco can hold more water than soil, so it slightly compensates the lack of waterholding because I add also 20% extra perlite (more oxygen) which doesn't hold much water. I can't overwater a big plant, always let the drain be sucked back...

The_Wizardza said:

Update.

It's still not spreading to the very top leaves. The affected leaves remain healthy aside from the strange colour. The affected areas are dry and crisp, but not affecting the leaves negatively (obviously aside from effecting photosynthesis). It hasn't spread to my other pots and plants even after physical contact so it's not a bacteria/virus/fungus. The plants have been fed so it cannot be a deficiency, maybe a toxicity but everything I find online mentions yellowing first. The affected plants did show magnesium deficiency 2 weeks ago but that has been treated and the discolouration signs are gone. This isn't effecting the plants grow rate at all. Which is why I'm confused. If this was causing any stress to the plant then the plant would show it. Thanks for all the advice so far

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After seeing this update I would definitely say thrips damage. Get some yellow/blue stickypads and see if you can catch those fuckers!

They will not kill healthy plants but they are indeed annoying and will affect quality.They can be hard to catch by eye, they range in different range of colours. Everything from white to, yellow/orange and brown.

To everyone above.

Thank you for all the advice.

Sadly it's not a deficiency, not a toxicity. Yes possibly light burn from the sun after it rains, but then it wouldn't be spreading when it's not raining. It's not pests because I've sprayed the plants twice in their lifetime. Especially under the affecting leaves. Also if it was thrips it would be spreading to my second pot right next to them and it hasn't.

So no it's not any nutrients, light burn (which is light brown btw, not rustic metallic in colour) or pests. I'm still thinking it's some kind of mutation. The growth rate of the plants affected hasn't slowed at all and these are genetics I bred myself. I'm hoping more to find someone who's seen this before. But everyone I ask hasn't seen anything like this. Or know what light burn and nutrient deficiencies look like lol to add to that, the plants are still showing some magnesium deficiency, but seeing as it only shows 3 weeks after it starts affecting the plants, they should recover from that in the next week or so considering their first good feed was 2 weeks back.

Again thank you everyone for the advice.

Possibly EXTREME magnesium deficiency. But the browning should be starting from the points of the leaves then. But again, it could possibly be that severe.

Okay, my own stupidity for assuming this can't be a deficiency. I've overlayed the effects of extreme magnesium and calcium deficiency and the necrotic patterns on the leaves make sense. Spotting in the middle due to the lack of calcium and necrotic edges from the magnesium deficiency. I have been feeding them so clearly it's a pH problem. I've just tested the soil pH and it's 5.9, considering magnesium and calcium stopped being absorbed at pH 6.5 in soil I think we've found the problem.

Thank you so much for everyone's advice.

Hope you all have an awesome day

PS I was pH testing the water I've been giving them. Even recalibrated my pen the last time I fed them. Between 6.5-6.7 every time I watered and fed them to achieve a range. Clearly the clay or something in the soil is lowering the pH. It's a home composted soil from my garden. I'll keep an eye on it in the future

Just thought I'd add quickly. I had to flush the soil with water pH'd to 9 to get the soil pH above 6.5 to 7. Crazy how important a role pH plays.

Our indoor and potting soils hold more that enough air for growth without the need for coco or perlite.

Imo coco and perlite are crap soil amendments, you can grow without and many do zero problems

Kassiopeija said:

yes, I like Coco very much and always add appprox. 20% of it to my soil in order to make it more airy plus coco can hold more water than soil, so it slightly compensates the lack of waterholding because I add also 20% extra perlite (more oxygen) which doesn't hold much water. I can't overwater a big plant, always let the drain be sucked back...

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The_Wizardza said:

PS I was pH testing the water I've been giving them. Even recalibrated my pen the last time I fed them. Between 6.5-6.7 every time I watered and fed them to achieve a range. Clearly the clay or something in the soil is lowering the pH. It's a home composted soil from my garden. I'll keep an eye on it in the future

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Glad you got it straightened out. what testing method did you use to test the soil ph? NC State developed a method for monitoring pH and EC using pour thru leachate testing. It’s a bit involved but might be helpful in your situation.

Kingrow1 said:

Our indoor and potting soils hold more that enough air for growth without the need for coco or perlite.

Imo coco and perlite are crap soil amendments, you can grow without and many do zero problems

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Roger that Capt. Plantwhisperer

Kassiopeija said:

Roger that Capt. Plantwhisperer

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Message recieved Lieutenant Industrytroll

I actually find it quite beneficial to mix together a bunch of different stuff to make my own soil and Cocos makes a great ingredient to lower the EC, e.g. for clones, seedlings less minerals needed overall. But every grow is different, so I can't say if things und that work for me would also work in your case. But the internet is full of inspiration, you'll find it if you just look hard enough

My soil aint broke and whereas topsoil has very little aeration when saturated most potting soils of peat nature hold quite a bit of air and adjustments made by the other ingredients the manufacturer added.

Some view potting soils as oxygen starved overwatered mediums but its far from and hence you might need futher considerations as to why your amending it by almost a third

Kassiopeija said:

I actually find it quite beneficial to mix together a bunch of different stuff to make my own soil and Cocos makes a great ingredient to lower the EC, e.g. for clones, seedlings less minerals needed overall. But every grow is different, so I can't say if things und that work for me would also work in your case. But the internet is full of inspiration, you'll find it if you just look hard enough

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Kingrow1 said:

Its a leaf with spots on

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Fuckin dying man ahahhahhahahhaha i love when a post makes me giggle that hard