The card does not describe mixing corn silk with other herbs or adding it to blends: according to it, the infusion is made only from dried corn silk (1 teaspoon per 200 ml of boiling water). The composition of the product is corn silk only.
General information (not a manufacturer's instruction): the composition of a blend and the dose of each herb are better checked on the packaging; in case of doubt, especially during pregnancy or when taking medication, consult a doctor.