I got mine off Amazon crazy enough. A company there called OutsidePride sells a variety of seeds more aimed at permy type stuff. Couple bucks for the seed and a couple for shipping. They also combine shipping so if there's anything else you're wanting checkout their other selections. Haven't planted the nettle yet, but the purslane seed I dropped on the bare earth around my new raised bed is coming up nicely.
I have a 10x20 patch of stinging nettle in my yard, but I have never collected seed from it. If the process isn't too difficult, I may be able to help you out.
I sell the seed and plants , Are you wanting the seed for planting or medicine? Sharon
(www.sharonsnaturalgardens.com). There are photos of the plant on my listing
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