Hemp has a good aspect ratio, length to diameter, which is what you need for a strong filament.
Hemp OSB board is also useful
I was a deckhand in my youth. I must preferred a hemp rope for catching anchor buoys from the back of a tugboat. The hemp was much more pliable and made throwing it easier to catch the T on top of the buoy. The polypropylene ropes were of immense strength but difficult to handle and throw. They were great for just tying up to the dock.