After establishment, keep your lawn mowed to a height between 1.5 and 2.5 inches. Except for possibly the first mowing, it is advisable to never remove more than 1/3 of the grass blade at any one time. For instance, a lawn that is maintained at a height of 2 inches should not be allowed to grow beyond 3 inches before being cut.
Cool-season grasses like those we have in the northwest actually slow down their growth or become semi-dormant during the summer and winter depending on your watering and fertilizing habits, mowing may be necessary only after every other week or so. During spring and fall these grasses grow at a much faster rate and usually need mowing at least once a week. During summer months taller blade height will promote deeper roots and make the grass more drought tolerant. Mowing taller than normal i.e. 3 inches will help keep your lawn greener with less watering.
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