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All Marigolds are edible, but only some taste good. The three best are Tagetes lucida, Tagetes patula, and Tagetes tenuifolia. Marigold can be used as a substitute for saffron. The citrus flavor makes it great in salads. Usually only the petals are eaten, no green parts. Used for heart, circulation, headaches, earaches, fevers, hair rinse for shiny hair. Plant beside other garden plants to keep pests away.