[PaulF]

I have used several of the more popular soilless mixes both as seed starter and as the potting up medium with few problems in the soilless mix; other problems were caused by me.

The mixes with slow release fertilizer tend to have nutrients enough but I have been know to add a little liquid plant food if the seedlings need a boost. I will never again use the mix that has "water keeper" or "water saver" or whatever it is called. That was a disaster the one time.

I have used a premium seed starter mix and did not have any better results than with the less expensive soilless mixes (but not the cheap-o mixes that have bark and rocks and tree branches).