Pot marigold (Calendula officinalis) is a flower species belonging to an entirely different genus from the true marigolds, though it is in the same Asteraceae family. Its flowers resemble those of marigolds or chrysanthemums, but the foliage is much different than that of marigolds, lacking the ferny texture. And it has a shorter, earlier bloom period than the true marigolds, flowering in May and June.