Damn, I buy a lot of seeds! I had managed only the Grey-headed Coneflower as far as cold-stratification until today, so I did the rest. This year, I didn’t use soil; I used leftover sand from the fish tanks. It’s supposed to be inert, so I’m hoping I haven’t ruined all of my seeds, but if it doesn’t leach anything into a fish tank, I can’t imagine it’ll affect the seeds except that by stirring them into damp sand, I’ve scarified the seeds that needed it without actually expending much effort. 😀