u/Astronomer5903

Hello,
this is my first grow but with issues. I have four plants and need advice, when I should harvest them.

I'm familiar with the 70/15/15 rule, but I'd like your opinion.
All plants were palnted at the same date.

In the list below shows the varieties and the flowering times.
Is it an good idea, to harvest Mandarine Jam already? I am currently at floweringweek 7, but the hair aren`t mostly brown yet.

-Mandarine Jam, flowering period 6-8 weeks
-Big Bud, flowering period 7-9 weeks
-N13 Kush, flowering period 7-9 weeks
-Honey Melon Haze, flowering period 9-10 weeks

I did not use any fertilizer. Because of this, the color isnt the same.