by 
The Curious Bag
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<h4 class="dechead">On One Hand: Fine Fescues
Some types of grasses, like fescues native to many areas, grow only 4 to 6 inches when they are not mowed. Some varieties of fescues, however, can grow to between 8 and 12 inches. By not mowing these grasses and letting them go to seed they can produce thick, rich lawns.
On the Other: Other Varieties
Other varieties of grasses need mowing to maintain lawn health and to help keep the lawn looking good. Mowing these types of grasses encourages shoot growth and helps these grasses develop into a thick, lush lawn.
Bottom Line
Whether letting grass go to seed is a good idea or not depends on the type of grasses in the lawn. If the grass has been seeded with certain varieties, preventing the grass from going to seed will result in a thicker, healthier lawn. However, for other varieties, allowing the grass to re-seed itself will have a more positive effect.
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