Help! with pics

Hi all
What is this?
The veins are turning yellow!!!
And then eventually starts yellowing/whitening from the base of the leaf towards the tip.
Could this be High pH?
Or lack of a specific nutrient?
The stems are deeep purple, and few veins as well..
Growth as slowed dramatically..


Thanks 4 any input

No one has any ideias?

The nutrients too adequacy ！

what is this plant growing in soil or hydro ?
what are your feedings?
whats ph look like ?

this info will help us get to root of problem

Leaning towards nutrient burn that what it looked like on my first grow, answering Timewalk's questions will be of more help though.

Soil..
Havent started feeding..they are 3 to 4 weeks old..
pH is 7, sometimes around 8..thats pretty much it.

2xM said:

Soil..
Havent started feeding..they are 3 to 4 weeks old..
pH is 7, sometimes around 8..thats pretty much it.

Click to expand...

From what I know you should be at least doing 200ppm with nutirents at 3-4 weeks old I think your plants are hungry!!! I had that same yellowing at the top and as soon as I fed they got better and started growing fast. Also that ph at 7 is a bit high 8 is really overThe best range for nutrient uptake with soil is generally 6.3-6.5 . Im new my self but I've been doing a whole lot of research into it and been around a few growers to know that much about PH levels! hope that helps

Feed and get ph to 6.5 @3-4 weeks you could have had a bigger more healthier plant if you had fed weeks ago.

Thanks 4 the answers..that's what i'll do.

P lock-out from high ph. add some elemental sulfur to your soil to lower ph to 7

Are red stems a sign of P or Mg deficiency???
Saw a video explaining red stems as Mg def, but read a lot about red stems being P....kinda confusing.. :/