Calendula is sometimes called pot marigold, and although it's in the same plant family (the aster family) as our common garden marigolds, the two lovely annual flowers live in different plant tribes.
Ordinary marigold flowers don't possess the same healing phytocompounds as calendula and shouldn't be used as substitutes.
(Although marigolds in the tagetes genus have been used by traditional healers, I haven't investigated these uses, and haven't tried them myself.)
Calendula is sometimes called pot marigold, and although it's in the same plant family (the aster family) as our common garden marigolds, the two lovely annual flowers live in different plant tribes.
Ordinary marigold flowers don't possess the same healing phytocompounds as calendula and shouldn't be used as substitutes.
(Although marigolds in the tagetes genus have been used by traditional healers, I haven't investigated these uses, and haven't tried them myself.)