I wouldn't worry too much about that. Hemp grows like hay, fast. They should easily be able to harvest 2 to 3 full cuts per year. If they have the appropriate acreage, they should have a surplus on hand at all times to sell if not needed for their own finished products, allowing them ample time to transition to contingency supply measures, in which case costs would be no worse than they are now, as long as they secure the necessary insurance and vital equipment has well constructed shelters in which to ride out a storm.
Especially since a large increase in the global supply of high quality hemp will bring the price per ton down considerably. To your point, there's definitely no way they could ever be completely immune from hurricane associated headaches, but I would think that their exposure would drop significantly as they continue to grow and eventually create multiple supply chains which could be ramped up if needed.
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