For grass as others have said, try a Delta, Rocna or another plow type.
A "Bruce" (in quotes because real Bruce anchors are no longer made.) is not the best choice for grass.
"Winged scoop anchors are modified plows with manta-like wings extending from the sides. They were specially designed to anchor oil rigs in the North Sea. They have a reputation for setting quickly and they, too, stow neatly in a bow roller. They perform well in sand and adequately in mud or rock, but often have difficulty penetrating weed and grass."