Congratulations on the signs of reaching the end of your first grow! It all looks beautiful. And yes of coarse you'll be able to get those leaves away. Do a wet trim when its time, getting the largest fan leaves off, probably will end up being many of those yellowing leaves. I agree with the flushing of plain water, although a friend who grows for the dispensaries believes that's like starving someone. I think that is absolute nonsense. You don't want your weed tasting like nutrients right? That's partly why we flush to get those extras bits up and outta there. I didnt know it was called the senescence thanks
@b4rns