I think that was a phonetic spelling for sphagnum.
The premixed soil is in a garbage can and it is frozen solid by me. Oh how I tried to hack at it with a shovel but it didn't budge. *We also have a sandbox filled with great sand that could be rinsed but that's frozen solid and would need an ice pick too. *Another month or so for us and I'm thinking we should be able to get at our bins of soil.