What did i do to my plants? :(

I would just let them dry out for a day or two if that's what it takes. I don't see nitro toxicity myself. You don't have waxy dark green clawed leaves just droopy ones from not enough air to the roots.

I'm not sure if you've mixed generous portions of perlite with your mix or not but that is definitely the answer for the condition I see. Your soil doesn't have good enough drainage and aeration for rapid feeding. The leaves breathe co2 but the roots need oxygen to stay healthy. That's why hydro systems have an airstone.

I would make a new mix with 20% perlite and transplant them to finish flower. Ideally use a fabric pot spaced off the drain tray with plenty of air circulation. That will promote excellent aeration which is what you are lacking.

I finish my medium plants in 7 gallon smart pots. That's good for up to 1 pound plants.

 

What is the percentage compared to soil? At least 15% with maybe a layer of just rock on the bottom? If the answer is no then you don't have enough drainage.

 

Precision perlite course is my goto I swear by. It's like grower's gold for cannabis. Mix it with any medium you use at least 15-20% and your plants will love you for it. They take off like rockets.

 

It resists compaction of the soil over time with the lite large perlite pieces. Perlite stores water like a sponge that continues to give up it's moisture to feed the plant while at the same time letting air pass through. There is substitutes. I recently read on this forum about using rice husks instead. I'm not sure the plants would love it as much as perlite though. It's pretty magical. It doesn't biodegrade very quickly at all compared to rice husks.

 

That is classic overwatering symptoms in your pics. A plant that big should be feeding fast enough to not get much of that unless the medium is retaining too much moisture or is too compact.

 

Overwatering and lack of drainage are really the same problem if you think about it.

 

I don't think it's rootbound. I think the medium isn't draining good enough. I could rebound that in a few days and you will too. The main problem right now is too much water in the medium and not enough air.

10 gallon would be the logical step up 15 gallon is larger then I've heard of much indoor.

Get a 10 gallon fabic pot and a bag of perlite. Make sure the perlite has no nutrients in it.

 

Upward stems with droopy leaves..yep

 

Never heard of not being able to reuse perlite. I have some in my yard that is years old and won't go away. Makes me look like a weed grower or something. =)

Space that fabric pot off the drain tray with pieces of cinderblock if you have nothing else smash one up.

 

Fwiw I thought I had extra perlite but turned out I had gnat nix instead. Since its crushed up grow stones, I threw it in the mix. Expensive compared to perlite but it works well.