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I am using a mix of my own composted soil and sand with a small amount of wood and bone ash mixed in for potting soil again this year. Thyme leaves that were collected and dried last fall are steeped in water, mixed 2 cups per gallon with rain water this concoction helps to stave off the dreaded dampening off disease. As they begin to emerge the plants are sprayed with this for the first couple days to help combat any unfriendly pathogens in the soil...keeping the soil warm also helps prevent these issues. I use rain water because it seems to help the soil stay soft compared to our tap water that, due to it's high mineral content, sometimes causes the soil to form a hard crust.
These plants are growing in cut off milk jugs that have been placed in larger plastic containers to act as a sort of mini solarium under the lights to help hold in the warmth while growing on our much cooler porch.
...and, I watched and greatly enjoyed the below video this morning. From http://www.nfb.ca/film/my_urban_garden.
NFB's Synopsis:
In this short film, Halifax gardener Carol Bowlby harvests a mouth-watering crop from her small backyard plot. In considering soil quality, lack of space and a short growing season challenges rather than obstacles, she offers a wealth of practical growing tips for urban gardeners. By heeding Bowlby's advice, bountiful organic gardens work equally well on apartment balconies, in small or large city lots or in a rural setting