An inexpensive and readily available pruning blade for pruning crop growth, such as grape vines following harvest, has a disc-like base plate. The base plate has ordinary small diameter radial Skil-saw blades mounted around the periphery. The saw blades are fixed rotationally on the base plate by a clamp and have a portion of the saw teeth extending beyond the base plate periphery so that rotation of the base plate induces cutting action by the saw teeth at the periphery of the base plate. When the extending saw teeth become dull, the clamp is loosened, the saw blade is rotated through an arc sufficient to expose sharp teeth at the base plate periphery, and the clamp is tightened.