Easy... The farmer plows them under each year, and they come back up as either Garbanzo Beans or some variety of Wheat! The problem is they do not retain their color so I can't really find them in the spring/summer. So, I just keep adding them to the area!
They really are fun to shoot - they provide instant feedback, sometimes not always what you want to see but...
When they are out there and I am shooting at them they are Elk Hearts!