3 Rivers Biotech with VP Sales and Business Development, Kevin Mehr. Washington is the home of their licensed facility, but they ship premium tissue cultured plants all over the US and world. From Washington to Florida, they’re here to help hemp farmers de-risk their operations, scale their production safely, and reap the benefits of this exciting crop. Almost every clonally-produced crop has moved to tissue culture plant starts for a reason. Plants that are starting disease-free tend to be highly vigorous throughout their life cycle and focus more energy on growth and secondary metabolite production, augmenting the performance of the crop and economic return.