I’m sure she is not the only one that thinks the only companion plant is Marigolds. The article below is taken from the website Rodale’s Organic Life. It sets out many plants to put together, or pair up, to work as companion plants to protect and greatly enhance each other.
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Organic gardeners know that a diverse mix of plants makes for a healthy and beautiful garden. Many believe that certain plant combinations have extraordinary (even mysterious) powers to help each other grow. Scientific study of the process, called companion planting, has confirmed that some combinations have real benefits unique to those combinations. And practical experience has demonstrated to many gardeners how to mate certain plants for their mutual benefit. Companions help each other grow—tall plants, for example, provide shade for sun-sensitive shorter plants. And the technique uses garden space efficiently. Vining plants cover the ground, upright plants grow up, allowing for two plants in the same patch. Companions also prevent pest problems. Plants like onions repel pests and other plants can lure pests away from more delicate plants. Or one plant may attract the predators of another plant’s pests.
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To read the entire article and discover many plants that you can use for companion planting, go over to Rodale’s Organic Life.