Strange Deficiency

Hello! I know there are charts and everything but I did a whole lot of research and never found something that looked really like what's happening to my plant.
About a week ago the veins started to go yellow from outside in and from bottom to top.
It kinda looks like a magnesium deficiency but usually, with Mg it's the fleshy parts of the leaves, between the veins that go yellow, not the veins themselves... So I'm at a loss here



It's not too agressive and the progression is slow, but I still have 3 weeks to go MINIMUM before I can harvest so I'd like to keep some leaves to power my bud growth.

I even tried directly googling the symptoms "yellowing veins" but I only found two results and neither of those had the solution.

I'm growing two LSD25 from fastbuds and the green pheno I have right beside it is just starting to show yellowing veins now. Apart from that they look happy, growing fast and the leaves are perky.
Only real problem appart from that resides in the heat as the weather got pretty crazy lately.

Thanks for reading and I hope somebody knows what this strange unheard issue is!

Looks like typical late flower nitrogen "deficiency". In later flower this is good.

Big thanks!
I'll try upping my N levels a bit
I'm just very confused that it's the veins that go yellow and not the leaf tissue itself

But it would make sense!
The most affected plant stretched quite a lot more than the other and I pulled back on the nitrogen as my leaves started to show clawing so this would explain that

Cannaprentice said:

Big thanks!
I'll try upping my N levels a bit
I'm just very confused that it's the veins that go yellow and not the leaf tissue itself

But it would make sense!
The most affected plant stretched quite a lot more than the other and I pulled back on the nitrogen as my leaves started to show clawing so this would explain that

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This is exactly what you want to see at this stage. Don't up the N levels. You want this to happen in late flowering as it prevents making harsh smoke. If you up anything in late flower it should be Potassium and Phosphorous.

Nitrogen is a mobile nutrient. Leaving the fan leaves on until they are yellow allows the plant to relocate that nitrogen from the fan leaf to the growing bud.

Renfro said:

Nitrogen is a mobile nutrient. Leaving the fan leaves on until they are yellow allows the plant to relocate that nitrogen from the fan leaf to the growing bud.

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That makes sense!
But I wouldn't say I'm in late flowers, it's still budding and it just started to swell
here are pics of my buds just starting to fill up

here's the main cola of my other plant that has less yellowing

Cannaprentice said:

That makes sense!
But I wouldn't say I'm in late flowers, it's still budding and it just started to swell
here are pics of my buds just starting to fill up
View attachment 4369180 View attachment 4369179
here's the main cola of my other plant that has less yellowing
View attachment 4369181

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That actually looks like a cal-mag issue I have with a White Widow strain. And by the looks of those pistils you have a few weeks to go. I would give it a small feeding with a good dose of cal-mag.
BTW, nutrients if given properly will not affect the way your smoke tastes or how harsh it is. The plant will only take what it needs from the nutrients and use it where it needs it, kind of like your body gets protein from meats or shelled nuts, doesn't mean you're gona taste like a steak.

I just fed a small quantity of Ph'd water with a light dose of N and a stronger one of CalMag.
Let's see how it goes.
as you say, it still have some weeks to go so it's definitely isn't time to flush and relocate those nutes yet.

I was being really gentle with my feeding up until now to avoid burning them but it seems like now that flowering is on it's way they start getting really hungry!

Cannaprentice said:

I just fed a small quantity of Ph'd water with a light dose of N and a stronger one of CalMag.
Let's see how it goes.
as you say, it still have some weeks to go so it's definitely isn't time to flush and relocate those nutes yet.

I was being really gentle with my feeding up until now to avoid burning them but it seems like now that flowering is on it's way they start getting really hungry!

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Your cal mag has nitrogen. Be cautious with nitrogen in flower especially.