One of my cannabis plants (known as Plant 4A-1) has one large fan leaf on the 4th node going up from the base that's turning yellow and browning on the tips of the fingers. All the other fan leaves are green and healthy. Not sure why only this leaf is dying but should I prune it off or should I let it fall off on its own?
Leave it, when the plant has used what it wants from the leaf, it will fall off all by itself. Plants will discard leaves that don't get any light (sometimes).