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Anything super yellow or dead remove the plant has sucked all available nutrients out of those leaves and keeping them in the plant is just wasting energy. That's why they are now yellow the plant is trying to save them at the same time it's sucking the life out of them. Anything green leave on until yellow
You can but its not necessary. I would pick out some of those dry, yellow leaves just because they can make your buds look ugly and are much harder to remove /clean up when dried. 🌱👍