While many consider clover a "weed," there's really nothing wrong with having a little clover mixed into your lawn....
David Beaulieu
Photo of red clover leaf.
The Irish consider various tripartite clover leaves (such as the one in the photo here) to be "shamrocks." As I relate in my article on shamrocks and four leaf clovers, the tradition behind the shamrock is quite distinct from that behind four leaf clovers.