This article contains a slide show of 8 herbs which make up what they call a healing garden. None of these herbs will take care of the big illnesses, but can aid with headaches, skin irritations, cuts, inflammation, and the one which appears in almost all, flatulence.
All of these can be grown in your own backyard and for many of us, probably are already there.
By the same people, 10 herbs you can grow for cooking. Hmm. They seem very similar to the first group.