Colorado State University horticultural professors recommend winter watering when the daytime temperatures are above 40 degrees F. Do this twice a month during our fall and winter drought season from October through March. For large trees, apply water to the most critical parts of the root zone within the drip line of the tree to keep the roots from drying out.
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Soil compaction is a major cause of turf deterioration. Compacted soil is caused by lawn traffic, walking, and mowing that reduce the area where roots can grow. Adequate amount of vital turf nutrients, including water, nitrates, phosphorous, potassium are unable to reach the level, where the roots lie.
Aeration removes small cores of turf that relieves the compacted soil and improves the exchange of air and water. The soil can easily absorb water, fertilizers, and nutrients promoting the deeper growth of the roots and thicker grass for next spring with fewer pest and disease problems. Once aeration is done, water the lawn and apply fertilizer to promote growth and allow grass to crowd out weeds for a thick healthy turf..
For optimal effectiveness CSU professors recommend aeration should be done twice a year in the spring and fall. Lawns that get regular aeration will be greener, healthier, and more drought resistant.