A tip I came across:
For those of you that love flowers and have a friend or acquaintance that loves fishing, ask them to save the "dirt" that their bait comes in. This can be added to your potting soil to boost its enrichment. You can put it directly into flower pots to revive that worn out soil, with out going to the expense of new potting soil.
Source: I read an article in our local newspaper about someone that raises worms just for the soil they leave behind. It was sold as "black gold". Having a husband that loves to fish encouraged me to do this on my own.

Linda, a lot of folks love vericomposting, worms are great for breaking down food scraps quickly! Check out the Soil and Compost forum for lots more tips and ideas: http://garden.org/forums/view/...

There's no doubt that there's great fertility in worm castings, but this might be a better addition to a ground garden. In the tiny, closed environment of a pot, it's virtually impossible to provide fertility & nutrients via soil for plantings that aren't temporary (like porch pots of annuals.) The microbes that make nutrients available to plant roots aren't able to survive in a pot, and tiny particles of any kind can cause roots to suffocate (and then rot, called "overwatering.") Tiny particles lodge closely together with no air between them, stopping the air circulation and evaporation process, and this can cause the suffocation. Roots need oxygen & moisture at the same time to function.

"Black Gold" is also a brand name for worm castings.
Perhaps you could share a link to the newspaper article so we could read it in its entirety?

Yes, Black Gold makes Potting Soils and Fertilizers:

http://blackgold.bz/products/p...
http://blackgold.bz/