How concerned should I be?

First post here, first grow. Already found tons of info on this page and thanks in advance for any help. I know they are probably in too small of pots but afraid to transplant at this stage so I may be fighting root bound issues but not sure.. ph trying to keep it around 6.5 and growing in emerald triangle “420 recipe”. Haven’t added any nutrients, didn’t plan on it. I was overwatering earlier but believe have it scheduled out before flowering but not sure because of the yellowing leaves and loss of leaves. Going into week 5 flowering small brown spots and dry leaf tips curling upwards. Any ideas what’s causing it or how bad it will effect? Lastly any tips on when to harvest for most “upper” feel? ✌️
 

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They are deficiency in nitrogen and don't have enough light.

As for when to harvest wait for all white pistils to turn brown and reced into the buds. Don't chop early on a thought that you want a upper high. All you will do it cut them before they have a chance to mature.
 
You’re probably 3 to 4 weeks out. If you don’t have a 60x scope, now’s the time to get one so you can look at trichs.
 
Theyre hungry, in particular for N and (I think) cal/mag. I usually top dress around week 4 of flower. Being root bound may be an issue, but live and learn. Have a good look at the root ball when they're harvested and I guarantee you wont let it happen again lol
 
When you have plants in too small of pots they will be hungrier more often because they go through all the nutrients in the soil quicker. So your plants right now if you never transplanted are like the starving kids in Africa.
 
When you have plants in too small of pots they will be hungrier more often because they go through all the nutrients in the soil quicker. So your plants right now if you never transplanted are like the starving kids in Africa.
Well not really, his plants haven't had their nutrition ravaged by civil war and famine....
 
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