This accounts for calendula's common name, pot marigold.
From the kentucky.com
Calendula, also called the pot marigold is grown commercially for herbal teas and the potpourri industry.
From the en.wikipedia.org
Pot marigolds will make a happy bedfellow to any vegetable plant, but don't sow or plant very small plugs next to a large pot marigold, because it will rob their nutrients.