On small production lots on which medicinal plants are grown, irrigation systems of a smaller capacity (“drip, drip” and “sprinkling” systems) are mainly used. The water for irrigation should be in keeping with the national and the potential European quality standards, and should be as “free” as possible of potential pollutants, such as feces, heavy metals, pesticides, and toxicologically hazardous matters. Therefore, in this chapter, several priority MAPs are selected according to their importance for this sector, and their needs are analyzed in drought and irrigation conditions. In this group of plants, the authors included the following: marshmallow (Althaea officinalis L.), peppermint (Mentha piperita L.), valerian (Valeriana officinalis L.), lovage (Levisticum officinale Koch), lemon balm (Melissa officinalis L.), ribwort plantain (Plantago lanceolata L.), marigold (Calendula officinalis L.), and basil (Ocimum basilicum L.)
