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How to Plant and Harvest a Three Sisters Garden: Plant corn, beans and squash together. Corn takes nitrogen, beans replace and grow up the corn stalks, squash is a natural "mulch" moisture barrier. Native American method.
I usually wait and buy most of my plants in May because I never know when to start my seeds indoors. This handy little chart lets you know when to start seeds indoors as well as when to plant outdoors.