Fern Flower is a magic flower in Slavic and Baltic mythologies. According to the myth, the fern flower blooms for a very short time on the eve of the Summer Solstice (celebrated on June 23 or sometimes July 7). The flower brings fortune to the person who finds it. In various versions of the tale, the fern flower brings luck, wealth, or the ability to understand animal speech. However, the flower is closely guarded by evil spirits and anyone who finds the flower will have access to earthly riches, which has never benefited anyone, so the decision to pick the flower or leave it alone is left up to the individual.
In fact, ferns are not flowering plants. However some experts think that the flowering fern myth has roots in reality. In the past, the grouping of plants was not as exact as modern taxonomic ones. Numerous flowering plants resemble ferns, or have fern-like foliage, and some of them indeed open flowers during night time. Also, certain true ferns, e.g., Osmunda regalis have sporangia in tight clusters (termed "fertile fronds"), which may appear in flower-like clusters, and as a result, they are commonly known as "flowering ferns". It could be the result of interbreeding between two plants.