The root dried for at least one year was macerated in alcohol for several weeks, according to the practices of eclectic herbalists. This preparation requires precise expertise and should only be made under professional guidance. Dosage must be validated with a healthcare professional or recognized pharmacopeia before use.
A small piece of well-dried root was sometimes briefly brought to a boil in water, then left to infuse. This preparation, reserved for knowledgeable practitioners, is not suitable for common use without supervision. Dosage must be validated with a healthcare professional or recognized pharmacopeia before use.
The dried root ground into fine powder was sometimes encapsulated for more regular use. Preparation and dosage must be determined by a qualified professional. Dosage must be validated with a healthcare professional or recognized pharmacopeia before use.
Southern blue flag iris is found wild in marshes and wet ditches of North America; in France, its dried root can sometimes be obtained from herbalists specializing in American plants.
The root is traditionally harvested in autumn, then must be dried and stored for at least one year before any use, as the fresh root is considered too irritating.