marijuana top leaves are yellowish...should I be worried?

Look like an N deficiency bro. What's your grow setup like? So we can better assist you

https://www.rollitup.org/t/first-grow-indoor-t5-cfl-power-flower-fem.801482/page-7#post-10442381

you just started flower, didn't you?

zinsi said:

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My plants do that it just grows so fckin fast lol every morn after lights out I gt new growth that colour within 2 hours of lights on it normal colour

That's not N deficieny, N will start with the lower leaves first and work it's way up.

Need more info but it looks to be just new growth is all, new growth will always be very light green.

If you haven't fed her then give her a good NPK and see if she changes any, start small and work your way up...

looks like and iron or sulfur def/lockout

giggles26 said:

That's not N deficieny, N will start with the lower leaves first and work it's way up.

Need more info but it looks to be just new growth is all, new growth will always be very light green.

If you haven't fed her then give her a good NPK and see if she changes any, start small and work your way up...

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i agree, all new growth comes in lighter like that and will darken up.. that does look a bit on the lighter side, but i think they look fine.. all of the older growth looks great, like has been said, that's where you usually see def. like nitrogen start first..
you could feed it a bit of nitrogen, but again, i think they look pretty normal..

looks like the flower explosion to me...

Here ya go this will help...

giggles26 said:

Here ya go this will help...

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Score! I just saved this pic.. Excellent info..

Yea, that growth is super light. I think I'd have a newbie heart attack if I saw that Best of luck. I'm sure it will work out.

details of grow...............