“While one might not necessarily think of soil as “inorganic” in the sense of “unnatural,” many commercial soils include high levels of chemical fertilizers, pesticides, fungicides, and herbicides. Soil is usually designed to encourage rapid, healthy plant growth while discouraging insects, fungi, and weeds, and commercial soil accomplishes this at any cost. Organic soil, by contrast, does not contain chemical ingredients, providing a rich substrate for plants to grow and using natural means in an attempt to control pests.
Instead of using chemical fertilizers, organic soil is amended with compost from organic sources, and manure from organically-fed animals. It may also be amended with things like mycelium, which helps the soil retain water and nutrients, along with organic mulch to aerate the soil and make it looser. Just like standard commercial soil, organic soil can be formulated for specific environments and uses, with varying pH balances and levels of nutrients. Good organic soil is extremely dark, moist, and fragrant.”
(From an article on soils)
As for what to grow – parsley, mint, basil, cilantro, romaine, carrots, dandelions, kale, etc. Whatever fits best in your area / for the season you plan to plant.