They are frequently recommended as a companion plant for vegetables to prevent insect and nematode damage. However, this is only half true, they are not that good with insects, having insect problem of their own including spider mites. Though they are quite impressive plants for handling nematode issues. They handle several types of nematodes and quite well, though French marigolds work better than African species. It’s best to plant marigolds as a cover crop in the rows or areas where you want to reduce the nematode problem.
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