Help! Many Issues! - Nitrogen Toxicity? Defiency in other stuff? pH?

(FYI in all pics the white dots on plant are 100% just some DE that I got on them more pics at bottom)

Alright so I am going to give a huge breakdown here since I have had multiple issues all show up at once and I feel like in trying to correct them I am doing more harm than good.


I am growing indoors what I am pretty sure is a sativa from a bag seed indoors under 2 CFLs and a multi LED plant strip. I am using fox farm ocean forest for the soil with 20% perlite. Currently the plant is in a closet with a fan for ventilation on 12/12, RH is typically around 55. I haven’t really tried feeding actual nutes until recently, just occasionally using natural stuff like coffee grounds etc through veg.

Everything was going great once I hit the veg stage and throughout I was doing 18/6 for lights and the plant was on a table near a window. The plant was doing good and I decided to replant it to a 12 inch diameter cylindrical pot as its final pot and topped it above the 6th node. At first the plant continued doing great however it’s growth did slow down a bit. I decided to do a pH test and NPK tests with a home soil testing kit (rapitest brand) . It showed that I had a pH of 5.5, low P, almost no K, and a nitrogen surplus. I really wasn’t sure about the validity of the NPK parts but I figured it wouldn’t hurt to raise pH a little bit. I added a tiny bit of baking soda water to try and make it a little higher. I also added some crushed up homemade wood charcoal as I heard that could lower nitrogen in soil.
Before I could really see what happened with this one of my lights fell and snapped the plant in half. I did want to flower soon since this was at like 8.5 weeks of veg but I figured I obviously had to wait for the plant to heal. Over the next week I babied the plant while it healed. I reduced the lights for a bit as I heard this was good to do and I saw 2 white pistils on a bud site. I didn’t realize that this was a bad thing at the time. It was also at this time that it got plagued by fungus gnats. It turns out the pot that I moved it to had horrible drainage (it had an attached drainage tray). So I figured I have to repot to better drainage but first I had to let it heal and kill the bugs.
Over the next week I killed bugs with neem, DE, no watering, and sticky strips. At this point the plant had healed well and didn’t look too bad for being snapped in half. I repotted the plant to a standard clay pot of the same size, during the process I lost some roots as the person who helped me repot it was very aggressive with my plant. The plant didn’t really experience any transplant shock though and it seemed fine for now. The leaves were dark green and I did see some clawing though. I figured that this could be nitrogen toxicity due to the high N result from my soil test.
So to correct my high N i tried to do a flush. I also set up a new space for the plant in the closet in preparation for flowering. A lot of brown water left the pot (but now I don’t think I used enough water at all). My tap water comes out at 6.5 which is what I used. I put the plant in the closet and it looked fine post flush. Two days later my roommate closed the door on the closet while I was gone which I had left open to dry and this caused it to get way too humid. When I got back it was like 70% RH and the plant had black/ dark brown edges on lower leaves which I thought were septoria. At this point I figured this was just due to the high RH event and so I flipped to 12/12 (this was this last sunday). Over the next day or so I worked on drying the plant off and what I thought was septoria ended up looking more like P and K issues. I did another pH/NPK test and now my pH is 7.5 or so, N is still high, P is low, and K is non existent. I added a less than half strength dose of tiger bloom.
So now you’re basically up to date with my plant’s very poor chaotic life lol. Where do I go from here? Do I give it a flush to try and lower N and fix pH? Do I feed nutes? Do I just leave it outside and let nature handle it? I’m wondering if my constant intervention is the worst part of this and if maybe the plant will be better outside. I really just want to limp through flower at this point and get the plant finished asap.

Deformed leafs from accidental reveg?


Moved plant outside for pics in sunlight


Hi, it looks like you’ve got the solution on hand:

You need to feed your plant more P & K at this point but no N. Nothing you can do about the high N other than nurse it along. There are products out there that should raise P like bat guano (check the label to make sure you have hi P and not hi N), worm castings. It can depend on what you have available to you locally and your choice. You also need to lower your pH down to the 6.2-7.0 range. Make sure you have Calmag on hand as may need additional Calcium. HTH.

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I have something that is 2-8-4 ,would you not recommend using this since it does have some N?

Sounds like Gaia Green, yes you can. Don’t know how much of N tox you got going right now so you’ll have to monitor that.

Edit #1: Just had a second look and it seems your new growth looks fine, just a bit mal-nourished. Those dark green leaves at the bottom is the result of your P & K def. Use the guidelines on the label. Cheers.

Edit #2: The pot looks portable. Can you not have the plant take in as much sunlight as it can? You can always finish it off in your closet for the duration.The sun’s UV will help tremendously here. As for the fungus gnats, try putting some mulch on the surface like sand so the adults can’t burrow in and lay eggs. I use eggshells that I crush up and layered on.

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it def is portable just a little heavy haha. i actually did completely wipe out the fungus gnats. So are you saying to take it outside during the day? main reason ive kept it inside was to avoid stuff like caterpillars.

I would, it looks like it could use more lighting.

On second thought, it might not be that good an idea unless you could find a way to keep those nasties off. You might end up infesting your indoor grow room. Best would be to invest in better lighting than CFL’s for your lighting would be the limiting factor at this point.

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unfortunateky the plant seems to be getting worse quick. i think its going to die

Can you post a pic of the whole plant?



Looks like K def. Are you feeding them the 2-8-4 now? At what pH after adding your nutrients? Those leaves will likely never recover but you have to monitor the plant for any progression. As long as no other leaves are affected, you should be good.

Don’t be tempted to add more of your nutes than what is recommended. I know it’s hard not to but the rest of your plant looks fine other than being a bit underlit.

i have been using those nutes but ive been a little cautious because i was afraid of over feeding them. its strange how some of the lower leaves are going light yellow like a nitrogen deficiency. makes me worry that root rot is causing bad nutrient uptake. or is it normal for lower leafs to die during flowering? the top still lookw healthy. is it pulling nutes from leafs that dont get enough light? i trimmed off some of the worst looking material

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Yes the plant will start to cannibalize itself during the last stages of life. As long as the top looks fine to you, you’re good. I usually leave those damaged leaves until I can see progress with treatment then either leave them on or snip.

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