Fall Pollinators: Leaves and Stems

The aging stems and leaves of fall become a pollinator’s winter sanctuary.

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Fall Habitats

Fall is a time of preparation for pollinators as they prepare for winter. As the mating season slows, some pollinators migrate south, while others remain in their current location to overwinter. More importantly, the preparations they make in the fall, play a vital role in determining their survival during the challenging winter months.

Pollinators undertake several essential tasks to prepare for winter:

Fuel up for migration or winter survival.
Find shelter underground or in hollow stems.
Prepare the next generation to emerge in spring.

To assist fall pollinators with preparations for winter, resist the temptation to clean up the entire garden or blow away decaying leaves. What may appear as decay is actually a vital winter habitat for pollinators. Leaving some of the fall garden standing, creates a winter home that provides them with shelter during the cold months.

A tidy garden can inadvertently remove essential spaces pollinators need to survive.

Why Fall Care Matters

Garden clean-up in the fall directly affects the health of pollinators in the coming year. After the fall colors fade, fallen leaves serve as a nursery for pupae, larvae, and caterpillars to overwinter. By leaving a few leaves beneath the trees, we create a nursery for spring-emerging pollinators to overwinter.

Letting fall plants overwinter offers serval benefits:

Seeds and dried flowers provide shelter and food.
Stems and plant debris offer shelters for pupae and overwintering adults.
Undisturbed soil protects ground-nesting bees.

Bees in Fall: The Final Push

Fall marks the end of the life cycle for many bee species, while others enter a resting period.

Worker bees naturally die off as part of the life cycle.
Solitary bees have already pupated and remain dormant in hollow stems or underground chambers.
Bumblebee queens are mating and searching for livable winter sites in loose soil and leaf litter.

To aid bees during the winter, create safe habitats for them by leaving a few bare spots for ground-dwelling bees and some leave litter for insulation. Keep a few dry stems standing for cavity-nesting bees.

Butterflies in Fall: Migration and Shelter

Fall butterflies either migrate south or overwinter in place. Migrating butterflies fly south following the late-season trail of nectar flowers, goldenrods and asters, to fuel their journey. Overwintering butterflies shelter in trees and crevices and emerge as adults in early spring. Some butterflies, on the other hand, overwinter as chrysalises and emerge as adults in spring.

Migrating Monarchs rely heavily on late-season nectar from goldenrods and asters to fuel their journey.
Early-emerging butterflies overwinter in tree crevices.
Chrysalis attach to stems, fences, or leaf litter.

Monarch Butterfly on Milkweed — Monarch Butterfly (Danaus)- Milkweed

Whether butterflies migrate or overwinter, late-blooming flowers serve as essential fuel sources, especially for migrating species.

Create a Pollinator-Friendly Fall Garden

Simple choices can have a lasting impact on pollinators. Migrating pollinators appreciate late-season nectar, while overwintering pollinators need shelter in trees, leaves, and soil. Too make a fall garden pollinator-friendly, consider these actions:

Let some tall perennials stand and leaf-litter stay.
Bundle cut stems and place them in a quiet area.
Leave some areas un-mulched and untilled.
Plant native fall flowers like goldenrods and asters.
Collaborate and report monarch sightings on apps like iNaturalist

Fall gardens become a refuge for pollinators that overwinter or migrate.

By doing a little less cleanup, landscapes become a winter haven. Pollinators can complete their life cycles and return again in spring.

Useful Links

Pollinators by Season

Spring Pollinators: The First Buzz of Spring

Summer Pollinators: Nature at Full Speed

Winter Pollinators: Shelter in Fallen Leaves and Stems