Started seedlings off into solo cups containing Fox Farms Happy Frog soil mix as to not burn my young seedlings. At the end of the 2nd week I transplanted the seedlings into 1 gallon fabric pots and included some organic fertilizers along with some homemade worm castings and compost to add a little microbiology into my soil and help break down my organic fertilizers. The amendments I used include bone meal, kelp meal, blood meal, sul po mag, worm castings, compost, and perlite. These were all added to Fox Farms Ocean Forest (FFOF). This may be a bit overkill but they way I see it the organic nutrients should be available after the seedlings get a little bigger. In my experience it is pretty difficult to burn your plants with organic fertilizers.