Gillyweed is a magical plant native to the Mediterranean Sea. When it is eaten by a witch or wizard, one grows gills and webbing between the fingers and toes, allowing them to process oxygen from water and navigate underwater more easily. There is some debate among Herbologists as to the duration of the effects of Gillyweed in fresh water versus salt water, but the effects of Gillyweed in fresh water seem to last about an hour.
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One Thousand Magical Herbs and Fungi (Herbology)
FanfictionThis version of One Thousand Herbs and Fungi includes only the main herbs and fungi, making it an easier read for beginners.
