Should You Remove All Fallen Leaves From Your Garden?
The Verdict: Busted. Fallen leaves are one of the best free resources your garden produces. Removing them all wastes organic matter and harms soil life.
Why People Believe This
Tidiness runs deep in garden culture. A "clean" garden with bare soil looks cared for, while a layer of fallen leaves can look neglected. There are also legitimate concerns about disease: if a plant had fungal problems, its fallen leaves can harbor spores. But the solution is targeted removal of diseased material, not a scorched-earth approach to every leaf that hits the ground.
What the Research Says
UC ANR and the UC Master Gardener Program actively encourage leaving fallen leaves in garden beds as mulch. Decomposing leaves feed earthworms and soil microorganisms, improve soil structure, add organic matter, retain moisture, and moderate soil temperature. A UC Davis study on urban landscape waste found that leaf litter supports a diverse community of decomposers that contribute to long-term soil fertility.
The Xerces Society has highlighted another critical reason to leave leaves: they provide overwintering habitat for beneficial insects, including native bees, predatory beetles, and butterfly pupae. In Santa Cruz County, where our mild winters allow year-round soil biology activity, a layer of fallen leaves is essentially a slow-release fertilizer and a beneficial insect hotel rolled into one. Removing it all and bagging it for the landfill is throwing away garden gold.
What to Do Instead
Leave whole or shredded leaves as mulch in garden beds, around fruit trees, and in perennial borders. A layer 2 to 3 inches deep is ideal. If you have heavy leaf drop that smothers your lawn, rake leaves off the grass and move them onto your beds or into your compost pile. The one exception: remove fallen leaves from plants that had significant fungal disease (like peach leaf curl or apple scab) to reduce reinfection. Shred large leaves with a mower to help them break down faster and prevent matting.
This week: Instead of bagging your next batch of fallen leaves, spread them as mulch around one tree or garden bed 2 to 3 inches deep.
For more on building healthy soil, check out our free Soil Health Guide at Your Garden Toolkit.
Frequently Asked Questions
Should I rake up and remove all the fallen leaves in my garden?
No. Fallen leaves are free mulch and slow-release fertilizer. Removing them all wastes organic matter and removes habitat for beneficial insects.
What are the benefits of leaving fallen leaves in beds?
Decomposing leaves feed earthworms and soil microbes, improve soil structure, retain moisture, moderate soil temperature, and shelter overwintering native bees, beetles, and butterfly pupae.
When should I remove fallen leaves?
Remove leaves only from plants that had significant fungal disease, like peach leaf curl or apple scab, to reduce reinfection. Otherwise leave them in place.
How should I use leaves as mulch?
Spread whole or shredded leaves 2 to 3 inches deep in beds and around trees. If they smother your lawn, rake them onto beds or into the compost, and shred large leaves with a mower so they break down faster.
