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The thermometer is dropping and so are leaves as autumn progresses. Homeowners are reminded by Iowa State University Extension and Outreach horticulturists that removing fallen leaves allows the grass time to manufacture and store food before winter arrives. Leaves can go in a compost pile, but since they contain high levels of carbon and small amounts of nitrogen it may decompose slowly. To promote decomposition, leaves should be mixed with grass clippings or other materials with high levels of nitrogen. Leaves do not make for a good winter mulch, as they tend to mat down and trap moisture under them.

In Washington, leaves can be taken to the yard waste center at the waste water treatment plant. The city’s leaf vacuum will begin cleaning up leaves in the terrace areas between the streets and sidewalks on October 21st. It will continue through Thanksgiving. Do not put leaves in the streets as it can block drains and become a hazard.