You probably associate four-leaf clovers with St. Patrick and Shamrocks, but the tradition actually started long before that.
In the early days of Ireland, the Druids thought they could see evil spirits coming when they carried a shamrock, or three-leaf clover, which gave them a chance to get away in time! They thought four-leaf clovers offered them magical protection, and warded off bad luck.
The leaves of four-leaf clovers as a lucky charm can stand for: faith, hope, love, and luck. Some also believe that the fourth leaf symbolizes the Grace of God.