Orris root, derived from the rhizome of Iris germanica and related species, has a long history of use in European herbal medicine. Traditionally, it has been employed as a remedy for coughs, colds, and bronchial conditions, often in the form of powders, tinctures, or lozenges. The rationale for its use as a decongestant is based primarily on its mild aromatic and expectorant properties, as described in traditional herbal texts from the 17th to 19th centuries. These sources suggest that orris root may help to loosen phlegm and ease respiratory discomfort. However, there is little to no modern scientific research validating these effects. Clinical trials are lacking, and major pharmacological references do not recognize orris root as an effective decongestant. The evidence supporting its use for colds is thus largely anecdotal and historical. Furthermore, orris root contains compounds (notably iridin and isoflavones) that have mild activity but are not proven to relieve nasal congestion. Due to insufficient scientific validation and the potential for allergic reactions, orris root is not commonly recommended in contemporary medical practice for treating colds or as a decongestant.