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Companion planting has a long history of use by gardeners, but the explanation of why it works has been filled with folklore and conjecture. Plant Partners delivers a research-based rationale for this ever-popular growing technique, offering gardeners dozens of ways they can use scientifically tested plant partnerships to benefit the garden as a whole. Through an enhanced understanding of how plants interact with and influence each other, this guide suggests specific plant combinations that growers can use to improve soil health and weed control, decrease pest damage, and increase biodiversity, resulting in real and measurable impacts in the garden.