Question: Why is it necessary to rake leaves off the lawn?
We spend a lot of time in fall raking leaves (or, if not actually raking leaves, then using leaf blowers, etc. for leaf removal). Is there a sound reason behind raking leaves pertaining to lawn health, or is it simply an aesthetic choice?
Most lawns in the Northern U.S. are composed of one or more cool-season grasses. "Cool-season" lawn grasses are so called because they're most active during those periods of the year when moderately cool weather predominates. Fall is one of those times. Blessed with sufficient sunlight, nutrients and water, and enjoying temperatures that are neither too cold nor too hot, cool-season grasses such as Kentucky bluegrass revitalize themselves in fall. This is when they must "make hay," strengthening their root systems.
But a thick layer of fallen leaves can impede the growth of these grasses. Why? Because they can deprive the grass of one of the key elements I mentioned: sunlight. If not raked up in time, a thick and/or matted layer of fallen leaves casts excessive shade over the grass below. You don't have to rake up every last leaf; a shortcut is to mow, so as to shred left-over leaves.
landscaping.about.com/od/landscapecolor/f/why_rake_leaves.htm
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