I found in my bag last night the hemp tow that I had forgotten I'd bought at Sheep & wool last weekend.
I've discovered two things about hemp- it makes me sneeze and it makes me itch. It's very scratchy to work with, and I'm glad I got less than an ounce of the stuff. I even tried blending it with some wool last night- double yuck.
I'm sure that I'd get used to it it time, but I think that I'll stick to animal fibers for now, and just keep the hemp and flax for demo purposes.