Leaves curling down

I am doing my first grow and could use some tips!

Plants are at the end of veg, 18 hour cycle, temp 62-78F, humidity 30-70%
Soil/coco mix, pH is 6.5
I wait for the soil to completely dry out before watering (3-4 days)

I have been keeping the ppm around 1500-1800 mostly. I thought I was blocking K uptake by giving too much N so I cut the nutrients in half on my last feeding to see effect (700ppm). Now one of my plants is showing a hard down curl (see pics)

Everything i've read has said this would be N tox or over watering but neither quite make sense to me.

What do you guys think? Deficiency?

Thanks for any help or suggestions! Much appreciated



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How old are they? Also I don't think that N toxic. I just had that with mine it looks ,ore like this.



See how it goes straight then the end makes a claw or talon on some? Also you will have really weak stems where they fall off very easy, crazy bushy growth, and very dark green leaves. Will also feel rough or dry.

What's your soil? Maybe try to feed new few times with plain water. Seems young for such a high ppm as well, I was up around there and it was a mistake. But also depends what you are giving.

After I tuned it down, lost the claw and growth has increased.

Leaves curling down is to much chem bud,flush once then go lower on range

every so often flush your soil with pure water id say every few waterings. once a week? you might be over watering honestly depends on the root growth not the pot size. sounds like your doing all the right things. just have to play with it a little bit. every strain is different. like my tangerine dream right now does that. all my other plants love getting watered everyday in coco. tangerine dream gives me signs of over water claw downward leaves

you make sure that when you water them you get run off from the bottom?

kachiga said:

How old are they? Also I don't think that N toxic. I just had that with mine it looks ,ore like this.

View attachment 3663274

See how it goes straight then the end makes a claw or talon on some? Also you will have really weak stems where they fall off very easy, crazy bushy growth, and very dark green leaves. Will also feel rough or dry.

What's your soil? Maybe try to feed new few times with plain water. Seems young for such a high ppm as well, I was up around there and it was a mistake. But also depends what you are giving.

After I tuned it down, lost the claw and growth has increased.

Click to expand...

Will get back later with the exact soil type.

I have been doing feed, water, water cycle so they should be getting plenty of pure water.

They are actually a few months old, just had to keep them in veg while we got our flower room situated so thats why I have been feeding generously.

The weird thing is that I only saw these symptoms when i decreased the feed by 50% on this last cylce.

arcalion said:

you make sure that when you water them you get run off from the bottom?

Click to expand...

Yeah I have been getting a little runoff but honestly not a lot. I heard you should have about 20% runoff but have achieved that yet. Does that sound about right?

DANK PURPY said:

every so often flush your soil with pure water id say every few waterings. once a week? you might be over watering honestly depends on the root growth not the pot size. sounds like your doing all the right things. just have to play with it a little bit. every strain is different. like my tangerine dream right now does that. all my other plants love getting watered everyday in coco. tangerine dream gives me signs of over water claw downward leaves

Click to expand...

Thanks for the input, they are in 15 gal pots, we transplanted them about a month ago and they were totally root bound at the time. They were stressed at the time but have been growing lots since so i think we have good new root growth.

been feeding every third watering so they definitely get fresh water.

I will make sure they are nice and dry this time before giving more water, hopefully that will do it.

Thanks