Companion planting (also called intercropping) helps plants grow better through mutually beneficial relationships. A frequent example is the Three Sisters growing method: beans give nitrogen to the soil, which helps corn and squash grow. The squash, in turn, gives shade to the soil, keeping it moist, and the corn provides support for the beans to climb on.
There are many other combinations to try, each suited to your tastes and space. You can read some more suggestions here, or place a hold on one of the titles below:
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