Toro 21012B Operator's Manual page 18

Operation
Sharpen the blade.
Walk at a slower pace while mowing.
Raise the height-of-cut setting on your mower.
Cut grass more frequently.
Overlap cutting swaths instead of cutting a full
swath with each pass.
Mow across the marginal areas a second time.
Cutting Leaves
When cutting is complete, always be sure that
50% of the lawn shows through the cut leaf
cover. This may require one or more passes over
the leaves.
Walk at a slower mowing speed if leaves are not
being cut up finely enough to be hidden down in
the grass.
If you cut up a lot of oak leaves, you might want
to add lime to your grass in the spring. Lime
reduces the acidity of oak leaves.
GB–16