Flowers can be used fresh, or dried they are used as saffron to colour foods yellow.
The whole herb is digestive and sedative and used for indigestion, colic, and constipation. Externally it can be used to treat sore eyes.
It is a dye plant. Secretions from the roots are effective against nematodes in the soil, and the whole plant contains substances that are toxic to cockroaches. Growing plants repel whitefly.