how lawn mower blades start getting dull after only cutting grass.

Question

Say you’re a lawn mowing professional or just your regular average ol homeowner, but you’re extremely careful and never hit rocks or damage the blade in any way. The mower blades still get dull, with only blades of grass and grass is not a hard substance. How does something soft like grass, dull a lawn mower blade?

In: 92

Answer 1

Grass is not entirely made of soft things. A few percent of it is silica that forms into little phytoliths. Silica is harder than steel, so the tiny bits of silica can dull the steel.