EDIT: They've changed this offer to include a $2.95 fee for postage 🙁
Both myself and this freebie's submitted (Thanks Jim!) had to turn to Google to learn just what in the worldwas. Turns out it's excellent fertilizer for gardens, plants, etc. So all your green thumbs out there might enjoy this! But if your thumb is literally green, you might want to have that checked out by a doctor of something. It might be seriously infected!