A: Just add organic matter to soil dug from elsewhere in your yard. If you buy compost, make sure it's registered for use on organic farms. If you buy bagged soil, get a potting mix.
Shown: Meaty and prolific, plum tomatoes are the favorites in this garden. Though often described as "canning tomatoes" and viewed only as an ingredient in pasta sauces, they're also a great addition to salads and stir-fries.