Service
Flush cut
A flush cut leaves the stump level with the surrounding ground, so the wood is cut off at the soil line instead of being ground away below it.
A flush cut takes the stump down to the soil surface and stops there. Illinois Extension lists this as the shallowest end of the range: stump grinders can cut from flush to the soil line to over a foot deep.
A flush cut is quicker than a deep grind, and it leaves little or no hole. That can cost less, since the deeper you want a stump ground out, the more it will cost. The tradeoff is that most of the underground wood stays and rots slowly. Grass can take a long time to fill in over it.
A deeper cut that goes below grade removes more wood but needs backfill. Match the cut to your plan for the spot. The grinding depth shapes the result.