Forget
trying to make your lawn look like a golf course putting green,
and keep your grass longer. Longer blades discourage weeds and
pest insects, which means you are under less pressure to apply
toxic pesticides and herbicides. Longer grass also shades the roots
more, and helps prevent the soil from drying out. It tends to lead
to healthier roots, so your green carpet will be hardier, and should
require less water in the long run.
Experts agree that it's better to mow regularly, and to remove
no more than one-third of the blade length at a time. That way,
stress on the grass will be minimized. Don't forget to keep cutting
blades sharp, as that prevents the tearing that is hard on plant
tissue.
Different types of grass have different optimum heights, so it's
not a bad idea to consult gardening books, or speak with the staff
at your local nursery or the cooperative extension office to determine
what's best for your yard, and then aim for the upper range.