There was someone who packaged a material, that looked like Milkweed, but it was probably some man made material. My son-in-law gave me a small plastic container, but I lost it somewhere. So, one day as I walked around the pond, I noticed the seeds, floating on the wind. I gathered a cup full and picked the seeds off, and placed a few in a small container. I drilled a hole in the lid, similar to the store bought one's and I've used them, ever since.
As you say, probably a lot of other weeds, and other ideas, that will work. To me, it's just another way of using natural materials, to have during hunting, to aide in checking the wind. Free....and it works.