Can marigolds be used as a rotational crop?
Yes, but in order for marigold to successfully suppress plant-parasitic nematodes, marigolds should be planted at least two months before the susceptible crop is planted. This succeeding crop must be planted in the exact same site as the marigold. In addition, a nematode assay should be conducted prior marigold planting in order to determine what species of nematodes are present in the soil. This will help to determine which species/varieties of marigold should be purchased.
