Yellowing leaves!

Hi there, I’m very new at this. I grew these Northern Lights Feminized Auto flowering from seed and they’ve been doing great. This week the lower leaves are yellowing how can I save them? They’re about 7 weeks old.

Maybe I need this??

Looks hungry

She is hungry. It's a Nitrogen deficiency

Thank you. I bought some nitrogen and gave it to them last night. Hope it works.

Fish scale said:

She is hungry. It's a Nitrogen deficiency

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Should I cut the yellow leaves off?

Joya013 said:

Should I cut the yellow leaves off?

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I would leave them on just to see if the problem gets worse and keeps spreading to the rest of plant, they will naturally fall off anyway so I wouldn't bother cutting them off. Hopefully now you have give them a boost of nitrogen the problem won't get any worse

Feed your plants, feed them

You are going to want to get a well balanced feed, not just nitrogen. A general fertilizer contains nitrogen phosphorus and potassium. N-p-k

Fertilizer