The main two varieties of marigold are French Tagetes patula and African Tagetes erecta. The heritage French varieties are smaller and supposedly more pest repellant. The showier newer varieties have lost much of their aromatic qualities. The African are larger and showier. I only grow French.
Research has shown that growing marigolds as a pest repellant is a gardening myth. However, most gardeners would disagree, as their anecdotal evidence is strong. This is most likely due not to repellant properties, but the attractant qualities that bring in beneficial insects that do their job. Same outcome.
Research does prove them beneficial in lowering plant-parasitic nematodes in soil.
Growing
French marigold is planted in mass a season before planting tomatoes, garlic, onion, strawberry, snap bean, cucumber and squash to lower plant-parasitic nematodes. It is used prolifically by gardeners as a companion plant to attract beneficial insects and pollinators and as a trap crop for aphids and other pests.
It is used as an ornamental flower in containers, borders, and flower gardens. Marigolds can be used as a cut flower. Making sure to remove all leaves below the water line so they don't stink as the leaves rot quickly in water. The flowers can also be dried upside down and used in dried arrangements.
The only marigold that is edible is calendula. French and African marigolds are NOT EDIBLE nor medicinal.
Final Thoughts


