The stems are very tough once the plant gets beyond 5' tall, which is why this industrial hemp is used as a source of fiber. Good article with photo:
https://www.qdma.com/sunn-hemp-deer/
It says Sunn hemp can get 6-10' tall with stems 1-2" thick. If the highway department cuts it down it could clog the ditch. LOTS of biomass. I cut mine at 5' with 1/2" thick stems and although I chopped the stems up before tilling in, there are a lot of pieces still there as they didn't decompose much.
Southern Exposure sells it. That pack has a LOT of seed in it and mine germinated almost 100%.
http://www.southernexposure.com/inde...yword=sun+hemp
I grew it in a raised bed last summer to test it's supposed nematicidal properties. That bed got fall carrots planted and they're still there so I don't know as nematodes aren't active yet.
Hemp
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