I'm going to bring this to the table:
I've had really good experience with seedlings by mixing ROSE PETALS into the soil, which consists of some good clay I got from my in-laws farm, vermiculite, and Good Seed starting soil. I get a 1 cup glass, fill the bottom inch with fresh petals, and put the soil mix on top, then pop in a seed. Every time I've done this, the plant goes APESHIT, and develops a good, dense root structure.
Has anyone else tried this?
Also, I'm beginning to compost using trimmings from my Banana plant and pineapple cuttings.