A vigorous plant in a balanced soil is less subject to the weeds that come to compete for access to resources. Weeds are all plants that grow naturally where they are not desired. The term weed is unfit for the qualities that these plants sometimes contain (pharmaceutical, culinary, phytosanitary, ...). Thus, the daisy has anti-fungal properties against fungi that attack plants such as the graphiosis that has decimated most of the continental European elms and England.