The arrival of autumn means that the leaves on your property are changing color, as well as falling to the ground.
But if you were planning to add raking the yard and bagging up leaves to your weekend to-do list, think again. Experts say raking and removing leaves can be bad for your lawn – and for the planet, too.
Leaving at least some of the leaves in your yard can help fertilize your grass, provide shelter for animals and even reduce emissions from landfills. Here’s what you need to know about managing the leaves on your lawn this fall.
What can I do to help my lawn with leaves?
The natural fertilizer that fall leaves can provide is a great way to fertilize your lawn, David Mizejewski (naturalist, National Wildlife Federation) explained to USA TODAY.
“The leaves fall around the root zone of these plants, where they do things like suppress weeds or other plants from growing that that would otherwise compete with the trees and the shrubs,” he said.
“They slowly break down and compost right there at the base of the of the tree of the shrub, right above its root zone, where they return nutrients that the plant can then recycle and reuse next spring,” he said.
And mowing your lawn can break up leaves and bring nutrients to your grass, according to Maxim Schlossberg, an associate professor of turfgrass nutrition and soil fertility at Penn State.
“Since they’re smaller, they’re more rapidly dismantled and decomposed by microorganisms. And the whole recycling process of those nutrients being returned to the soil occurs more rapidly,” he said.
Why shouldn’t I bag up leaves?
You might reconsider how you rake leaves from your yard and bag them before throwing them away.
According to data from the U.S. Environmental Protection Agency, in 2018, landfills received approximately 10.5 million tons of yard trimmings, which includes leaves.
Mizejewski stated that methane can form from organic matter and leaves that have been sent to landfills. It is a greenhouse gas which contributes towards climate change.
“At this time of year, unfortunately, a huge volume of leaves just go sit in those landfills and produce all this terrible greenhouse gas,” he said. “The more we can keep that organic material out of the landfill, the better.”
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What does my leaf impact on the environment around me?
The layer of leaves on your lawn is “really important wildlife habitat,” according to Mizejewski, forming “an entire ecosystem in and of itself.”
“There are probably thousands of different species that actually live in that leaf layer,” he said. “Most of them are invertebrates, so think of everything from earthworms and little pillbugs and all sorts of little critters that live in that leaf layer. But also higher up the food chain, salamanders, toads, box turtles, shrews and chipmunks”
Many caterpillars find their home in leaf layers which provide food for birds.
“So what happens if you get rid of every last leaf on your property? You’ve just swept away and bagged up and thrown into the landfill the food source that the birds are going to need to feed their babies,” Mizejewski said.
Schlossberg warned you that if leaves are blown from your yard onto the streets, it can cause disruptions to drains and water supplies.
“When you have foreign debris, they can clog the grates, and that can prevent water from moving off of the surface of the street,” he said.
Leaves can also end up in streams and rivers where drains lead. That can affect the water quality and “sensitive species adapted to those waterways,” according to Schlossberg.
“It’s a little bit like a trash dump, if you will, even though it’s natural organic material,” he said. “It still persists and can be problematic.”
So can I ever rake up leaves?
If the leaves on your lawn are forming a mat over your grass, experts agree that you can move them as the weather cools across the country.
Mizejewski recommended placing leaves in garden beds or raking them into a bigger pile and letting them “naturally compost there and break down.”
“Don’t get rid of every last single leaf that falls onto your property, if you can. There’s great, easy things to do with them,” he said.
Schlossberg urged people to rake up leaves or break them up with a lawnmower if you’re expecting snow soon.
“Once there’s snow, you’re not going to mow, and that snow is really going to facilitate that matting, and that coverage is going to prevent the leaves from being displaced by winds. That’s the situation you really want to avoid,” he said.
However, whatever your plans are for the lawn’s leaves, experts recommend considering the habitat and other animals that live in it.
“We each have an opportunity to do to take this personal action and think about how our own little piece of the earth, our own yards or our own gardens in our neighborhoods or communities, are all opportunities for us to do something good for nature,” Mizejewski said.
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