Fall Pollinators: Leaves and Stems

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

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Pollinator Habitats

Fall serves as a crucial period for pollinators as they prepare for winter. As the summer mating season slows, some pollinators migrate south, while others remain in their current location to overwinter. More importantly, the preparations made by pollinators in the fall, play a vital role in determining their survival during the challenging winter months.

To ensure their survival, 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. Allowing some of the fall garden to remain 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 Pollinator Care Matters

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

When dried plants of fall are left to overwinter, they offer serval benefits for winter pollinator. First, seeds and dried flower provide spaces for pollinators to shelter during winter. Additionally, plant debris and fallen leaves offer shelter for larvae and overwintering adults while undisturbed soil protects ground-nesting bees.

Bees in Fall: the Final Push

For many bee species, fall marks the end of their life cycle, while others enter a resting period. As the season fades, worker bees naturally die off as part of the life cycle. One the other hand, Solitary bees build individual nests and hibernate within them from autumn until spring. In contrast, social bees such as honey bees, reside together in colonies, keeping each other warm throughout winter. Other bees, such as Bumblebee queens, hibernate alone underground or beneath leaf litter, debris, and rotting logs.

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. For cavity-nesting bees, keep a few dry stems standing.

Butterflies in Fall: Migration or Shelters

Similarly, butterflies face two primary choices when fall arrives. They must either migrate south or find a local spot to overwinter. Those that head south, follow the late-season trail of nectar-rich flowers. Along the way, goldenrods and asters offer the essential fuel needed to sustain their long flight. On the other hand, overwintering adult butterflies or chrysalises seek shelter in tree crevices and leave litter. Both emerge as adult butterflies in the spring.

For example, migrating Monarchs follow late blooming flowers as guides along their journey and for food as a fuel source. On the flip-side, early emerging butterflies, such as the Mourning Cloak, take a different path. They overwinter as adults inside tree hollows and crevices. Instead of nectar from flowers, they rely on the sap-flows from trees in the spring when they emerge..

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

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

Create a Pollinator-Friendly Fall Garden

Ultimately, small changes in our garden practices can have a lasting impact on pollinators. Migrating pollinators appreciate late-season nectar, while overwintering pollinators need shelter in trees, leaves, and soil. To make a fall garden pollinator-friendly, consider these actions:

Allow some tall perennials stand and leaf-litter undisturbed.
Bundle cut stems and place them in a quiet area.
Leave some areas un-mulched and untilled to provide natural shelter.
Plant native fall flowers like goldenrods and asters to attract pollinators.
Collaborate and report monarch sightings on apps like iNaturalist to help monitor and protect these pollinators.

Fall gardens become a haven for overwintering and migrating pollinators, providing them with the necessary shelter and food to complete their life cycles. By reducing our cleanup efforts, we create a winter refuge for pollinators, allowing them to return to our gardens in the spring.

Useful Links

Pollinators by Season

Spring Pollinators: The First Buzz of Spring

Summer Pollinators: Nature at Full Speed