Find four-leaf clovers

The four-leaf clover is a very rare variation of the common three-leaf clover. According to traditional sayings, such clovers bring good luck,[1] though it is not clear when or how this idea began. The earliest mention of "Fower-leafed or purple grass" is from 1640 and simply says that it was kept in gardens because it was "good for the purples in children or others"