I've always had good luck with Fafard 3b mix. I screen it for seedlings and use it straight for potted plants and in ground stuff, grow boxes, etc. If you can find a nursery that carries it in your area it's worth giving a try.
It doesn't contain much in the way of fertilizer which I like. I like to fert my seedlings on my own so I know exactly what they are getting. But you can certainly add a granular fert to the mix.
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