04/08/2026
With warmer temperatures come insect activity and our gardening activities, too. But even though you’re anxious to begin gardening activities, please wait to begin your spring clean-up. Leaving your garden debris until the nighttime temperatures stay consistently above 50 degrees (usually mid-April) allows pollinating insects to emerge once it is safe for them to do so. Some of them have spent the winter among last year’s leaf litter, dead stems, and other “messy” areas of our yards.
Think before you clean! Butterflies and moths may be within a camouflaged chrysalis on the stalk of their host plant. Bees may be laying eggs in the pith of stems left standing. Ground nesting bees may be sheltering in last year’s leaves. Native bees which overwinter in the soil will benefit from an undisturbed garden; wait to mulch until after temperatures have warmed and they’ve emerged.
The Xerces Society explains: “While you may begin to see bumble bees and ground-nesting bees emerge as flowering trees and shrubs burst into bloom, they still need cover during chilly nights and heavy spring showers. While mining bees, mason bees, carpenter bees, and bumble bees may be out and about by early April, other species such as sweat bees are still hiding out, waiting for the warmer days that arrive in May.” From https://www.xerces.org/blog/dont-spring-into-garden-cleanup-too-soon.
Find more information about spring garden clean-up at Extension
https://extension.illinois.edu/blogs/flowers-fruits-and-frass/2022-03-18-delay-garden-spring-cleanup-encourage-native-insects and https://extension.illinois.edu/blogs/garden-scoop/2021-02-26-spring-garden-cleanup
If you just can’t wait, limit your cleanup to just a few areas such as the garden beds near the front door or the street, which are visible to visitors and neighbors.