The word shamrock comes from the Irish name seamrog for the plant. As you may already know this plant is very much associated with the St. Patrick's day celebrations. Since Saint Patrick's day or St. Paddy's Day is the Irish national holiday, shamrock became the national symbol of Ireland from the 18th century. It is important to note that the four leaf clover plant which is normally seen in America is different from the shamrock plant which has only three leaves.
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