Yellow in the middle of leaves

[From seed 2 weed]

A lot of my leaves are starting to get yellowish in the middle of the leaf what could this problem be ? Somebody please help !

 

[Pbass]

Hiya @From seed 2 weed hard to say, what are you growing in/under and what are you feeding them?

 

[Bnelly]

A lot of my leaves are starting to get yellowish in the middle of the leaf what could this problem be ? Somebody please help !

Cannabis Plant and Pest Problem Solver - Pictorial

Here is a ready reckoner for Cannabis plant and pest problems. It has been put together by a master grower. I have edited for content and added to as needed. I hope you learn from this treatise. I have been doing a lot of research on sick plants and also helping out others a lot on sick plants...

www.420magazine.com

Check out this link, it has been an amazing help for me. It looks like maybe a Nitrogen Def. It talks about yellowing being normal in mid to late flowering, how far into it are you?

I'd save this pic too

 

[DutchinAB]

That is a great quick reference chart