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Nutrient replenishment: Some plants may actually improve the nutritional value of the soil.
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Those with deep roots such as melons and tomatoes pull from deeper in the soil while those with taproots or tubers like carrots help to break up compaction. Soil balance: Plants with different root structures when planted together may aerate the soil allowing them to pull a variety of nutrients from different parts of the soil.Other plants actually attract beneficial insects that serve as predators for harmful insects. Marigolds, for example, are good companions for many plants for this reason. Pest deterrent: Some plants are known to repel certain insect pests that feast on a particular plant.Pairing together plants with high water needs, for example, makes watering more efficient and ensures all plants receive the right amount of water.
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