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TheGardenLady received this question from Joyce.
IÂ love marigolds but am unable to keep them healthy. I have had the same problem in the past and gave up on them for a while. Now several years later the problem still persists. The foliage looks fine but the flowers and buds (all stages) are full of worms. They are about 1/8-1/4 inch size, vary from brown to beige in color and leave behind a sawdust-like residue on the flower. They burrow into the seed pod and even flowers that look unaffected have the critters inside. None of my other annuals are affected. They are all grown in containers on a balcony. Any thoughts and any treatment suggested would be welcome.
Marigolds, Latin name Tagetes, are usually one of the easiest annual flowers to raise because they have so few pest problems. In fact, they are often used to prevent problems for other plants because they get rid of nematodes in the soil. They are used as companion plants.  See here. Â
But like most plants, Marigolds like to have their environment just as it was in their place of origin. Marigolds, in spite of some of their names, originated in Mexico and Central America. There they had lots of sun and not too rich soil. Marigolds, if raised in an area where they do not get the conditions they want are more susceptible to problems. See here.