right now Industrial Hemp Fiber is generally a waste product of Plant Oil/Bio Diesel production
yes, there's a lot of uses for the hemp fibers, still, but stacking up some amount for use for string/wool/tough fabric probably is satisfied rather quickly considering the amount produced

allowing composting of the fibre gives it an additional use (bonemeal / bone block production) and allows a feedback loop for the cloches used in the Plant Oil/Bio Diesel production