You might ask why I planted the marigold flower with the tomato plant. We have found that marigolds repell the tomato hornworm. This pest is one of the worst for tomatoes and can literally devour the leaves on an entire plant in a single day. So, we are motivated to keep the tomato hornworms away. During the last three or four years that we used the marigolds as a hornworm control, we haven't seen any of these pests. It could be a coincidence, but before using marigolds, we would get hit with hornworms almost every year.
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