Thanks Michele, That doesn't look like what I usually get, and I'm sure mine isn't just bark. Utah doesn't have a huge amount of pine trees, which is probably why I haven't seen it here at a nursery, in bulk. I'm not sure I'd want to plant seeds in the stuff I can get, even if it's amended with sand. I think I'll have to test it on some seeds I don't care about before taking a chance and planting my good seeds in it!
I can buy bark in bags at Home Depot, but I've never seen it listed as being pine before, though it does look like pine. I've just never seen it that fine!
Here is what I buy