Marigolds are a wonder-drug of the companion plant world, invoking the saying "plant them everywhere in your garden". French marigolds produce a pesticidal chemical from their roots, so strong it lasts years after they are gone. Mexican marigolds do the same, but are so strong they will inhibit the growth of some more tender herbs. They help most plants, especially tomatoes and peppers, cucurbits (cucumbers, gourds, squash), brassicas. It repels nematodes, beet leaf hoppers, other pests
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I love the idea of mixing flowers and vegetables. I know marigolds have helped keep away squirrels and some bugs. I harvest the seeds in the fall from the marigolds and store them in a dry place until next year.
Yellow, orange marigolds - Marigold flowers are known to give away a strong scent that helps in keeping away the bugs. Organic gardeners often grow marigold around their crops and plant to keep aphides and mosquitoes away.
Mexican Marigolds for deterring many pests, including deer, when planted at the outer edges of your garden. Burn marigold leaves as a tick repellent or obtain essential oils by steam distillation. Use the marigold plant externally to remove ticks from your skin. Soaps with marigold are excellent for your skin and candles made with marigold are perfect for aromatherapy.
Companion planting guide and which plants to use to naturally repel pesky insects.
plant tomato plants on sides to encourage strong roots