I tried getting moss from my yard and putting it around my tree. It didn't go over too well. There were tiny, tiny, tiny(stress the word tiny) little white worms in it. I figured this out a couple days after. I do know though, you can buy some moss spores and then use them. But you gotta grow 'em. I imagine that won't take too long. You can buy them from [url]https://www.dallasbonsai.com[/url]
It comes in a 1 table spoon quantity. This may not seem like alot at all but it's enough to cover a 12 inch by 12 inch surface area.
Now, for that blending thing. I suppose it could work. I mean, the paste would still have the spores in it right? Never heard of it but I would try it on a tester plant.