Hello everyone! Getting into growing and need a little help. I have a few strains going and have started making clones. I monster crop them and all seem to be good but my bubba kush plants. All seem to have the same deficiency. Leaves start getting brown and black spots then start to yellow. I’m using Great Lakes water only soil with 3 gal smart pots and have gave them water that is 6.5 ph. I can’t figure out what is wrong and the people that sold me the soil said do not feed because it will burn up the plant so I’m lost any help will be appreciated
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The solo cup is probably rootbound(?) and they look like the pH is too high(maybe try dropping the pH of your water even more & see if they respond. Or abandon that soil & go with something you trust more?
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Looks like a magnesium deficiency to me.
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Could be, a full plant picture would help. Natural light would help more. The more info you give us, the better we can help.
I’ll start with the basics , are you using well water, tap water, or RO water?
Is this happening on all leaves, or just the older growth?
What about your lighting how long are they on, what kind of lighting, how many watts, and how far from the plants?
Temperature and RH?
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Plants have not been fed. Was told if I feed with Great Lakes it will burn them up. They also said it was good for 8 grows start to finish
Veg under 4K led
Tap Water ph at 6.5
General hydroponic ph up and down is what I use
Plants in 3 gal smart pots have been in dirt for 1.5 months from clone
Solo cups have been in dirt since June 9th. Transplanting today to 5 gal smartpots with FF ocean forest
I also picked up Buddha grow and bloom to start feeding.
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How long you figure they’ve been in it so far? I seen you said the 3gals were in it ~6 weeks but is it a second run with the same soil. TL:DR They’re hungry.
I’m not sure there’s a mix on the market that can go eight rounds unamended. The best of the best gardens struggle to go past four to six runs, never mind eight. It would need an immaculate recipe, and then it’d also be completely dependent upon having the proper life in the soil to keep nutrients solubilizing at just the right speed.
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Bro, I am just going to recommend the same as I do to every new grower, RO water, GH Maxibloom at 1.94 grams per litre and a PH of 5.8. All the way through. Flush/water them with PH 5.8 water only once ever week or two. .
For medium 30/70 Perlite/Coco. Water when the coco looks dry .After 25 years of growing, I still follow this in my coco tester tents. Follow this and providing lights/temps play ball, it’s near impossible to go wrong, I can guarantee it. You won’t get any deficiencies with this mix and you can concentrate of other stuff to do with growing.
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First run with the soil. Just started growing about 5 months ago. Didn’t feed because I was scared to burn them. I called the store that sold me the soil and now they are saying it’s only good for a 6 week veg. I will start feeding Buddha grow and see if it changes anything but the closest thing I could find on the net is magnesium deficiency
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To me it looks like nutrient burn honestly. If “they” have repeatedly told you not to feed with the soil its prolly running hot as is. If it’s the soil I’m thinking of it’s a super soil mix which makes the nutrients burn hypothesis more likely.
Also, the soil looks to be really dry. Ideally you’ll want to give them 1/2 gallon of water per 10 gallons of soil every other day or so.
Best bet to fix it if it’s too hot it’s to water them with microbial teas and extracts to add more biology to soak up some of the excess nutrients.
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So the issue likely is that really you don’t know what is in the soil in terms of plant nutrition, and nor do you know it’s bio-availability. So for example, some ‘super soils’ will rely heavily on rock minerals for various elements, though these may not be available to the plant immediately, or for some time until they have broken down some more. Also it sounds like a high nitrogen soil that is designed to be used up of Nitrates and then boosted for flower, but by how much?
So what is likely to happen is that because you are flying in the dark, you wait till a growth deficiency or issue turns up, then you try and guess what it might be, then you add stuff to fix it and wait for the next potential issue to pop up, except NOW you have complicated things because you have added things, so now you don’t know IF it’s a deficiency, too much of something or what. And off you go chasing your tail.
I think that soil is one of the more difficult mediums to get dialled in for indoor grows because you only really have experience and intuition ( and forums ) to guide you if things are not looking right.
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Thanks for the replies! I have decided to scrap the soil and go with FF OF. As far as the plants they are going outside to do their thing and what happens happens. I have tried to fix them but I’m kinda lost. Bottom looks like magnesium and top looks like iron deficiency. I’m hoping to have better luck with FF. This is the first grow I used a water only soil and the first time my plants went stupid like this. Although I haven’t grown in 10 years I still can’t remember a time I had these kinda problems hit all of one strain
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Sure looks like roots, it is probably too humid. Let the soil dry back a bit. 
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