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Leave the Leaves

University of Minnesota Extension, Stearns County News
October 25, 2017

Source:  Brenda Postels
Interim Extension Educator-Horticulture
University of Minnesota Extension
Stearns & Benton Counties

Leave the Leaves
By Brenda Postels, University of Minnesota Extension

ST. CLOUD, Minn. (10/25/17) — University of Minnesota turf grass experts know that the best dressed lawns begin in fall. After a long, hot summer, you may be thinking to yourself, “Why would I want to be thinking about my lawn when I just want to go inside and forget about it?”
Turf research has proven that fall is the optimum time to “invest” in the green you will enjoy next spring. If fertilization is on your dance card, then you are on the right track, but don’t forget about a resource that may be staring you right in the face – tree leaves.
For years, turf managers and homeowners have been raking and bagging leaves because we all know that when leaves pile up with wet, heavy snow, it can mean disaster for the turf plant below. The ban on yard waste during the 90s prompted turf grass specialists to begin investigating how lawns would react to having ground up leaves left on the lawn and the results may surprise you!
During the research, several years passed and turf scientists starting noticing several benefits including needing less fertilizer to achieve that spring green up. The second benefit was - no weeds!
The decomposing pieces of leaves cover up bare spots between turf plants that are an excellent opening for weed seeds to germinate. Experience has shown that nearly a 100 percent decrease in dandelions and crabgrass can be attained after adopting this practice of mulching leaves for just three years.
To get started, wait for a slightly dewy morning, elevate your mower deck to the highest setting and set out on your merry way, crossing over the leaves once or twice. Usually this can occur once a week, but if there is a heavy wind, you may find yourself mowing twice in one week. There will be an obvious leaf residue on the surface of the lawn that only lasts for a few days. The tiny pieces will eventually sift down through the turf and provide future weed control and essential nutrients that can save you money and time. Come spring, you won’t even notice the tiny leaf particles.
Up to 6 inches of leaves can be “mulched” at a time, depending on the type of mower you have. Push mowers will handle smaller amounts, but are still very effective. If you have a bagging mower, you can also alternate between mulching into the turf one week and collecting the ground leaves to use as mulch in landscape beds and vegetable gardens.
So if you want a recipe for a luscious lawn yet want to be “green,” put your rake away and don’t bag it!  For more information, contact your local University of Minnesota Extension office.