30" x 43" Shamrock Decorative Flag. Permanently dyed. Weather resistant. The Shamrock is a ubiquitous symbol of all things Irish. Regarded as a good luck charm, the shamrock is synonymous with St. Patrick's Day. The shamrock is a species of clover native to Ireland. Legend says that St. Patrick used its three leaves at a tool for teaching the Holy Trinity. To the Druids it symbolized the eath, sky, and sea.