I grow my starts in 36 cell trays. I put in a layer of damp peat in the bottom of the cells and then a layer of horse manure or
mushroom compost and then another layer of peat on top. The seeds germinate in the peat and as the
roots develop they get down into the manure layer. the bottom layer of peat acts as a filter to keep Down any possible odors. I don't even move the seedlings to a larger container as I was used to seeing seedlings sold by
local nurseries here that didn't have the heated space to grow huge plants in pots in this climate. Some years I transplant a few to foam
coffee cups in my sunniest window which I put out in the garden at the front of my staggered plantings to the garden.