I have experimented with boards and find that the best ones have an edge around them. Take an appropriate sized piece of plywood, and fasten a 1 x 1 inch strip on the edges. Lay the board down so that the 1 x 1's are on the ground and hold the board up off the surface slightly. Brush some dead grass or leaves around the edges.
Also, boards that are down for several years always top the new ones. Good luck!
