When should fan leaves start to die in flowering?

I am at day 21 of 12/12 lighting and I have some leaves turning yellow and dying off. It's just a few for now and I know it's normal for fan leaves to die off at the end of flowering, but is this too early? Thanks.

What area of the plant are they yellowing at? Top, middle, or bottom?

Some of the leaves near the bottom are dying and and a few near the middle are starting to turn yellow.

That fine, but if you see that the whole plant is yellowing before it's time, hit them with some N.

Greenisgold said:

That fine, but if you see that the whole plant is yellowing before it's time, hit them with some N.

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I agree with that.

One thing, when people are referring to feeding the plant Nitrogen, do they mean like veg nutes? or...what?

Sorry if that's a dumb question.

Darrens said:

I agree with that.

One thing, when people are referring to feeding the plant Nitrogen, do they mean like veg nutes? or...what?

Sorry if that's a dumb question.

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I was wondering the same thing. What can I use to feed N? I'm already feeding the plant FF Tiger Bloom and mollasses. It does look to me like N deficiency...but overall the plant is doing fine...but if it gets worse I'll want to address it.

How ya get them their added N is up to you! Generally, they're referring to liquid food

3 weeks in is when they start to fall starting from the bottom, never the top