To mow on a slope, it is best to follow the contour lines. A person moves along the contour line and mows the grass from top to bottom.
The gravity helps with mowing in this way – the "empty" scythe rises uphill and the biomass slides downward onto the land that has been already mowed. If the full semi-arc is not used during mowing on a slope, a shorter snath will suffice. Mowing on a slope is sometimes even less physically demanding than mowing on a plain. But when the grass is overgrown, the stalks often fall downhill. This happens also after a heavy rain. If that is the case, it is recommended to proceed from top to bottom so that the scythe blade can slide under the lying stalks. For this purpose, a longer snath is advisable and it is a good idea to insert a wedge between the scythe and the snath, so that the blade does not have a tendency to cut into the soil. Therefore the best snath size for mowing on a slope is the same as the one for mowing on a plain.