The mythical flower traditionally searched for during Baltic midsummer folklore is the fern flower.
According to legend, the fern flower blooms for a short time on Midsummer Night, sometimes described as the night of the summer solstice. A person who finds it is said to gain happiness, wealth, wisdom, or the ability to understand the language of animals, depending on the version of the story.
Ferns reproduce through spores rather than showy flowers, which likely helped make the supposed blossom mysterious. The legend appears in Baltic and Slavic midsummer traditions, including Lithuanian and Latvian celebrations. Young people may go into forests to search symbolically for the flower.
The fern flower is folklore, not a botanical species. Real ferns do not produce flowers, so the search is a cultural ritual and storytelling tradition rather than a hunt for a scientifically recognized plant.