There's a reason we don't use dirt in containers. It doesn't act like dirt in the ground, but like a sponge.
As for "starting soil", that's a question that presupposes an answer. Start in what you're going to grow in. Nothing special needed. I've tried special starter mixes and none performer any better than plain old Miracle-Gro Potting Mix.
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Stupidity got us into this mess. Why can't it get us out?
- Will Rogers
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