Im baffled, never seen my plants do this

I'm baffled. Please if anyone can help. I wanna fix it before it gets worse.

I have never seen my plants do this. The leaf is green, feels crispy to the touch but is curling. Some leafs are getting necrosis as well but that is another plant I believe has a PH problem. They look similar but maybe ill post them later.

This plant is about 2-3 weeks in flower. I gave veg nutes till this week and just now gave flower nutes. The only thing I can think of is that its lackin the phosphorus the veg nutes lack. Anyways, ideas please. Thanks in advance! I love you all no homo

This is ChemDawg.
I grow in Roots 707, Earthworm casings, perilite, coco coir, dolomitic lime, epsom salts in respect to how their are listed. Ph 6.0, I tested it today. Thats my mix, my temps are 76 degress humidity 45% grown under two 1000 watt lights in a 10x10 grow room. Any other questions please ask!

Does it typically curl and feel brittle?

It's flashing gang signs bro, it thinks its the baddest plant in the garden.

HAhahaha I think your on to something. It is in the largest pot I have lol. This plant is really healthy and the largest plant in the garden so I just wanted to see what you guys thought, as I have never seen my plants do this in the few years I have been growing.

Come on guys, I can use some other opinions here please!

hey man whats your soil PH runoff? was getting the same type of leaves when my soil was at like 3.5 PH lmfao
EDIT: if you do find your soil PH runoff too low, (check runoff by watering with 7.0 ph water and PH testing the water after) then add dolomite lime or garden lime to the soil do not use hydrated lime

I don't totally agree with this being a Phosphorus deficiency. To me it looks like a Magnesium deficiency... a Mg def. doesn't always have green veins along with yellowness of the entire sorrounding leaf... sometimes the leaf tips and edges may discolor and curl upwards. The tips and edges may feel dry and crispy... the tips can also twist and turn as well as curve upwards... just like your pics.

The best way, horticulturally speaking, to keep from getting deficiencies is this... for soil, keep the pH at 6.8, that's the best number for ALL available nutrients to be absorbed into the plant without any of them being locked-out. For hydro & soilless mediums its best to have a pH around 5.8.

I hope this helps in some way.

Thanks Guy, I have always associated my mag def's with yellowing but hey, Ill try a lil foliar feed and see what happens. Dmedicated- my ph is 6.5. I record my runoff after every watering and feeding and as far as I can tell my ph is good and my ppm is around 700ppm I believe ( Im not with my notebook) and I have been using veg nutes but switching to flower nutes next feeding ( tomorrow )

Did you guys notice the discoloration in the leaf? Its almost like a black but the rest of the leaf is healthy green looking.

lotso people viewed, need some more input. Its progressing after I have treated w epsom salts so I dont think its cal/mg.

Salt build up causing lockout maybe. Flush your soil then go from there.

shit son, thats some weird shit.



is the whole plant fucked up, or just part?

which part (if it's the upper leafs only, raise your lights)

my best guess with the available info, is that your lights were too close when you put them under the big lights and they got sunburned.

when moving from say, a veg room with fluorescent lights to an HPS powered flowering room, unless you move the lights up away from the plants for a few days they can get radiation burns, like a ginger kid at the beach.

The lights are good, I know what you mean, It does almost look like light burn. Crispiness and color and twisting etc. I went back today and it was getting worse. The leaves are yellowing and curling more. It seems to be concentrated in the middle upper half but not on the new growth.

Nute water on the leaves?

I appreciate the help! I know I have not spilled anything on them though

K Def. Google it.

Still say its a P def.
Try this link maybe you can pick one out that hits home.

http://www.420magazine.com/forums/problems-pests-disease-control/81275-cannabis-plant-pest-problem-solver-pictorial.html

I have books that show deficiency but this looks like none, thats why im asking for other people opinions. Google doesnt help.

I agree, I the Phospherus myself but we will see. Ive up'd their bloom nutes, Ph is still optimal so I know they will use them if needed! Thanks for the link mile high, it explains things a bit better then some of these books I have lol