I use whatever potting mix was cheapest at the garden center (bought six bags last year). Unfortunately this current mix has no additional fertilizer in it so if I do not fertilize them the seedlings don't get over 4" tall (found that out the hard way). After potting up there is generally a lot of soil in relation to plant size so light fertilizing (1/4 to 1/2 strength) gets a relatively large amount of nutrients into the pot.
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