Printed from: https://conservationhandbooks.com/toolcare/sharpening/spades-shovels-and-hoes/
Spades and hoes can get blunt from use in stony soils, and shovels show wear and damage along the blade in normal use. If badly nicked, briefly grind using a bench- or angle grinder, taking care not to overheat the edge. Alterna- tively, hold the tool firmly in a vice, and use a medium grade...