Leaves yellowing too fast?

Brix420

New Member
Hey guys its my second grow
So basically i have been fooled in a seed shop into telling me i got autoflower Northern Lights when in fact idk wtf i got. They have been growing for 4 and a half months now outdoors.
My drainage is not that good but i haven t had any problems till recently.
I am currently on week 6 and the leaves started yellowing at a very rapid pace (from bottom but they raised to 3/4 of the plant)
Ever since i noticed they had started flowering i stopped feeding them Nitrogen. Also my buds smell like farts- literally like some fat basic fart but they look healthy. It has been pretty cold lately during the night and i have a theory that they did this because they understood autumn has arrived, but this doesn t explain the fart smell of the buds (smells like suplhur)
Please help and thanks from advance
 
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