Need some advice on a sad plant

[Burchell]

Hey folks,

Hoping someone can chime in with some advise.

I have a sad plant

The plant in question a Northern Lights female. She's been vegging for a few months in a 4x4 under a mix of some cheap LED and quantum boards. Moved to LED + CMH a few weeks ago.

Soil is promix HP. Gaia Green dry amendments have been added at slightly below the recommended feed rate.

I've got a lot of clawing, twisted and canoeing leaves. The leaves are small.

I thought it may be a N deficiency and top dressed with a bit of feed. It almost looks like an N deficiency AND toxicity. I'm perplexed.

Any thoughts?

The clones I've cut and have been running in the same soil blend look fantastic, big plump green leaves.

I've got a few grows under my belt but this one is is fighting me lol.

 

[Pbass]

Hiya @Burchell. I'm no expert but looks like N toxicity, cal/mag deficiency. What are you doing for cal/mag?

 

[ChefDGreen]

What are you temps/rH like? That strain looks like it probably prefers a warmer environment. That claw could be from N or it could be from too cold and windy. How much wind do you have going on?

I’m not sure where you got your seed or clone, but that is a very odd looking NL. It doesn’t look like an NL to me at all. It looks like a landrace Sativa. NL is a heavy indica strain. If it is a landrace Sativa... you should have flipped about 6 weeks ago unless you’ve got like 5 feet of headroom and a couple more scrog nets.

 

[Stunned]

From the look of those plants, it looks like O2 and nutes have been choked off at the roots at some point.
I'm using Promix HP as well, but doing a modified hempy type setup with it.
What's your watering routine look like?
Is promix DTW? I dunno, it's my first time using it.
When I'm unsure about something, I'll flush and then setup a conservative routine I know has worked in the past.
Then you have a reference point moving forward as you adjust over time

 

[Burchell]

Temps are hovering in the 26 degree range
Humidity in the 60 degree range.

I'm unsure of where the seeds came from. I was gifted them from a friend. That said, the clones look great. Fantastic even. This plant looked great 3 weeks ago!

I was thinking N toxicity. Im hopping a few good flushings will fix them. I feed them about 2 weeks ago, but have gone overboard ... If not, ive got plenty of veg plants I can use to replace it.

As far as watering goes, I do let them dry down, not to the level of stress, but the soil is well dried between waterings. That said, I use well water which is a bit high in iron. Unsure if that's related (lots of very successful grows on said water).

Boo.. definetly user error, but it's painful to see a plant that looked so good for months take a sudden nose dive