Companion Planting: Basic Concept and Resources, published by Appropriate Technology Transfer for Rural Areas (ATTRA), gives in-depth information on the subject, including a chart of good (and not-so-good) companion plants. It also lists other resources, including books, Web sites, and study results. At the bottom of the page are detailed planting diagrams and variety recommendations for some traditional Three Sisters gardens.
Clever Gardening Technique
Apply Water Where You Need It
Will there be enough rain this summer? I hope so, but just in case, to make watering easier I created low, flat-topped raised beds. At planting time I built a little berm of soil circling each transplant, 8 or 10 inches across. When I water, I fill this little moat and let it soak in, then repeat a few times to make sure the root area is moist. If by any chance we get too much rain, I can easily rake down the little berms so water will drain away from the stems.