The garden of medicinal plants, with its well aligned cultures, is built according to the model of the Herbularius. It is one of the three components of the medieval garden, with Hortus (vegetable garden) and Viridarium (orchard).
At the end of the 8th century already, in chapter 70 of his capitulary of Villis, Charlemagne (around 742-814) recommended in the gardens the cultivation of 73 medicinal plants and condiments (the two not being separated, according to the famous council of Hippocrates (circa 460 – ca. 370 BC): “Let your food be your medicine”): aurone, marshmallow, dill, fennel, rosemary, catnip, lovage, mallow, mint, parsley, rose, sage , savory, rue … Monks and nuns were already cultivating medicinal plants to respond to the commandment to heal the sick. In an autarkic search, the cultivated plants were then used to feed the community, but also the people and especially the needy, to treat the sick and to bloom the chapel.