Another Odd Discovery At The New House

I have been discovering little odd objects scattered around our new property since we've moved in. I've posted the Blair Witch little tree houses I've found. And now this. In one part of our backyard there is some shrubbery and brush. Well we cleaned it all up and found someone had put a shovel head in the ground with the words "No Weeding" painted on it. Its odd and confusing. Why would there be no weeding? And why a shovel head? It makes no sense. Very strange.