Common Mallow. Primarily the roots, but the leaves and flowers are also useful Benefits: A soothing mucilaginous herb, marsh mallow can be used much like slippery elm bark for soothing any and all inflammations. Valuable for burns, sore throats, and digestive problems like diarrhea and constipation. Serve marsh mallow tea for treating sore throats, diarrhea, constipation, and bronchial inflammation. Mix it into a paste with water and apply topically to soothe irritated skin.