The 72 cel flats were test flats. One a bag of seed starting mix from Dollar General (very crap mix. Big lumps of clay, shredded tree bark, pebbles and even a piece of sheet metal, not recommended) , one an organic mix from Jiffy, and the last one is a custom blend. So far they all look good. Although the germination on the cheap mix was the fastest.
I did the test because people were talking about dieoff issues and I wanted to see if I could identify varieties or soils likely to have problems.
I think temperature and moisture are what you want to worry about most for germination. Other than that your choice of medium needs to consider how long they'll be in that soil. You don't want anything too rich, but time release fertilizer is okay if you add it to the mix. If it's already in the mix you don't know how much has already been released so that's probably not the best option.
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