Why fall yard care could start with doing less – but not nothing

Every autumn, homeowners and gardeners spend time raking, blowing, and bagging leaves in an attempt to keep their yards neat and tidy. However, this routine practice may actually be detrimental to local ecosystems. Far from being mere debris, fallen leaves form a crucial layer of soil that supports nutrient cycling and the well-being of various organisms.

As a researcher of plant growth in yards and gardens, I recommend leaving leaves on the ground, where they can provide essential winter habitat for native pollinators and act as a natural mulch for the soil.

Leaving leaves on the ground offers several benefits. Firstly, they serve as a winter sanctuary for native pollinators, including bees and other insects. Up to 70% of native bee species, including cocoons and larvae, nest in the ground, requiring somewhere to shelter during the winter months. Removing leaves from lawns and gardens destroys this vital winter nursery.

Additionally, fallen leaves are an evolved mechanism for nutrient cycling. Trees actively transport essential elements, like calcium, magnesium, potassium, and nitrogen, from deep subsoils into their foliage. When autumn arrives and leaves fall, these stored nutrients are deposited back into the soil. This process provides a natural, slow-release fertilizer that improves soil structure, water retention, and erosion prevention.

To maintain a neat yard while nourishing the ecosystem underneath, consider these practical tips: move leaves to garden beds or other designated areas rather than removing them entirely; create a 2 to 3-inch-thick layer of leaves in these locations; establish pollinator zones on the property; and avoid shredding leaves with a mulching mower, as this can kill overwintering insect eggs, chrysalises, and larvae.

By adopting a more thoughtful approach to fall yard care, we can ensure the health and sustainability of our local ecosystems while still maintaining an aesthetically pleasing landscape.