Sustainability Spotlight: Let Leaves Feed Your Lawn This Fall
This newsletter edition’s Sustainability Spotlight features an article written by Edward Cohen, Sustainability & Resiliency Commissioner.
I remember enjoying the fall when I was a Midwest kid back in the 50’s and 60’s. The heat of summer was departing and the trees took on amazing colors. Then it was an opportunity to get paid to rake and bag them up; but not before making huge piles perfect for us kids to jump into.
Now we know what we did then was not so smart. I’m not talking about the jumping part but rather the bagging and throwing them away part. If you think about it, it is amazing how trees pull sunlight and carbon dioxide from the air, turning it into trunks, branches and leaves.
Those leaves end up containing nitrogen, phosphorus and potassium plus other elements. Do those elements sound familiar? Those are the same nutrients in the heavy bag you buy, haul home and spread on your lawn.
Rather than going through all the trouble to collect and haul the leaves to the Olmsted County Composting site, here are some reasons why you might want to stop thinking of leaves as waste.
- When leaves are shredded into small pieces by a mower, their decomposing bits release nitrogen that becomes accessible to your grass in the spring.
- Leaves are physically, mostly carbon. As their small bits decompose and become part of the soil's organic matter, that loosens the soil allowing the roots of the grass to grow deeper and improves the soil’s ability to hold water.
- That same carbon modifies the soil in a way that improves the roots of the grass to better extract the nutrients from the soil it needs.
- At the same time, by mulching those leaves you are doing quickly what trees have been doing slowly forever; recapturing a significant amount of nutrients they invested when creating leaves.
Some final tips
- Leaves are easiest to mulch when dry and not too thick.
- After mulching, you should be able to see much of the grass. If you don’t, take another pass.
- Do the job with a rechargeable battery-powered mower. No more running for gas, fighting to get it started or the cost of regular maintenance. It also runs far quieter which you and your neighbors will appreciate. RPU offers rebates for select battery-powered mowers.
- When mulching your leaves, make sure to keep any debris off the streets and out of storm drains. Consider adopting a storm drain to ensure our local waterways stay clean.