Best Sharpening Stones for Bonsai Tools

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A dull cutter crushes tissue instead of slicing it, and crushed tissue heals slowly and often dies back. Sharpening stones differ in abrasive type, grit, and whether they run on water or oil. Coarse stones reshape a chipped edge, medium stones restore the bevel, and fine stones polish it. Bonsai tools complicate this further, since concave cutters have curved edges that a flat stone reaches awkwardly, so stone shape matters as much as grit does. We weighed cutting speed against how flat a stone stays in use, because a dished surface makes an accurate bevel hard to hold. We also looked at how easily each stone can be flattened again, and whether the grit range covers real repair as well as quick touch-ups. A combination water stone suits growers with one or two pairs of shears. Diamond plates suit anyone with a full tool roll or an edge that needs rescuing.