As The National Gardening Company plainly states, "A good seed starting mix holds moisture, drains well, and is fine textured. Fair enough. But what makes a growing medium organic? Some companies sell organic potting mixes, or else you can make your own. The organization ATTRA has published a detailed guide of what is allowed in organic potting soil. These agents include soil, sand, compost, spaghum peat moss or other forms of peat, coir or coir dust (a byproduct of the coconut fiber industry), newspaper, alfalfa, sawdust, clay, kenaf, perlite, vermiculite, limestone, and alternative fertilizers.
What is not considered organic is any mix containing wetting agents. An explanation in the Global Garden online magazine reveals that "soil wetters are essentially the same as detergents." Part of a class of chemicals known as surfectants, these wetting agents cannot be biodegradable to do their job effectively. Nevertheless, some soils are manufactured with them because organic mixes can be hydrophobic. Perhaps you've had this experience before; you pour water on your seedlings but it doesn't get absorbed. Wetting agents can reduce the surface tension of the water to so it is easier for it to enter the pores of the organic matter instead of sliding off of it.
A few commenters to a previous post have suggested soaking the soil before planting the seeds. It was not clear what kind of mix they were using, but if I find a good organic product I'll heed their advice. Even though my MSG plot and my gardens at home are not located near a stream or pond I would prefer to not to use any agent that poses a risk to aquatic organisms or potentially my plants as well. I checked two reliable local gardening centers; one has not opened for the season yet while the other only carried a couple of mixes that contained wetting agents. I was instructed to check back in a few weeks, if I can wait that long.