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Sharpening Pruning Shears Demands a Steady Hand: This tool is by far the fussiest garden tool to sharpen. The principle is the same as for hedge shears, but filing along the curved blade (Photo 4) asks a great deal of your fine motor skills. The other half of the pruning shears (Photo 5) has a thick, blunt blade that the sharp curved blade cuts against. This heavier blunt blade is one reason this tool is able to cut branches more than 1 in. thick. The blunt blade needs a crisp 90-degree edge. Think of the edge on a freshly cut piece of granite. Both the top and the side surfaces are flat, and where they meet you’ll find a crisp, sharp edge.