The plant often associated with St. Patrick's Day is the shamrock. Traditionally, the shamrock is linked to the celebration of Saint Patrick, the patron saint of Ireland, who is said to have used the three-leaved plant to explain the concept of the Holy Trinity to the Irish people. The shamrock is considered a symbol of luck and Irish heritage, and during St. Patrick's Day festivities, it is worn and displayed as a representation of the holiday. Its significance has made it an enduring emblem of Irish culture.