Answer: Growing a healthy lawn can be a challenge. First off, run some basic soil tests to check the fertiliy and soil pH levels. Add fertilizer and/or lime as indicated by the test results. You might also consider top dressing with a layer of compost to help feed the soil encourage healthy roots. Next, mow to a height of three inches. Never remove more than one third the grass height when you mow. This can mean mowing more often than once a week, especially in the spring. Mowing correctly can help the lawn grow thicker and crowd out annual weeds. Consider spot treating perennial weeds or digging them up by the roots. You might also want to check and see if there is anything different about the areas where the grass refuses to grow, possibly there is a something underground interfering with the rooting or the soil is different in those spots. Late summer to early fall is the best time to do any needed major lawn work such as core aeration or reseeding. In the meantime, good care may show some improvement. Here are some additional lawn care tips you may find helpful. You may need to cut and paste the complete url into your browser to make it work correctly.
Good luck with your lawn this summer!
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