Generally a harmless, mischievous Irish spirit. Although it could change shapes, it would often manifest in the form of a black horse. The Irish Druid priests believed that Pookas would destroy crops not gathered by Samhain.
Readers, please enjoy this guest blog post by Sandra Kynes, author of several books, including The Herb Gardener's Essential Guide, Plant Magic, and the new Witches' Encyclopedia of Magical Plants, among many others.
Although a few old books...