Moss and lichen were easy to overlook—small, gray-green, growing on rocks and bark, neither plant nor quite anything else. But the skilled healer knew these humble organisms held powerful medicines, especially valuable because they grew where other plants could not—in harsh climates, on bare stone, through winter when leaves had fallen.
These were not emergency remedies but reliable, consistent medicines available year-round. The warrior wounded in winter battle could be treated with moss poultice when healing leaves were unavailable. The shepherd developing infection in remote uplands could find moss on stones when no herb garden was accessible. The poverty-stricken could gather freely growing moss when expensive imported remedies were beyond reach.
Celtic healers recognized what modern science would later confirm: moss and lichen possessed antibiotic properties, helped wounds heal, provided nutrition during scarcity. These overlooked medicines saved lives when more celebrated remedies failed or were unavailable.