I’m constantly on the lookout for a definitive guide to the folklore of plants, especially Celtic or fairy plants. Mostly I’ve found bits and pieces here and there: Lady Wilde, or some in Katharine Briggs’ Encyclopedia of Fairies. Celtic Folklore Cooking, by Joanna Asala, features folklore interspersed with her recipes compatible with a modern kitchen (and American measurements). As an added feature, her recipes are indexed according to the corresponding Christian and Traditional holidays.
But I’ve yet to a find an encompassing all-in-one sourcebook.
In the meantime, my latest find is Trees for Life, a charity devoted to restoring the Caledonian Forest in the Scottish Highlands. Check out their Mythology and Folklore of the Caledonian Forest webpage at www.treesforlife.org.uk/forest/mythfolk/index.html Not just trees—other plants and animals of Caledonia are also featured.
Drop me a line if you have a resource to recommend.
Asala, Joanna. Celtic Folklore Cooking. St. Paul, MN: Llewellyn, 2001.
Briggs, Katharine. An Encyclopedia of Fairies : Hobgoblins, Brownies, Bogies, and Other Supernatural Creatures. NY: Pantheon, 1976.
Lady Wilde. Irish Cures, Mystic Charms, & Superstitions. (The version I have is selections reprinted in Irish Inspirations: Toasts, Wit & Blessings. Sterling Publications, 2009).