The shamrock very often indicates particular countries such as Ireland or Irish people. The Shamrock is also known as the symbol of good luck.
Dream dictionary: Shamrock dream meanings
To encounter or to see a shamrock, when you are dreaming, stands as an omen of protection. It signalizes about your need to be or feel protected.
If you dream of shamrock, then it suggests to look for protection as you feel very insecure.
This kind of dream indicates the Ireland or Irish people. It is also a symbol of good luck.