Fireflies and plants

Mon. Feb. 27, 2023

Click below to listen to my 2 min. Garden Bite radio show/podcast: Fireflies and plants

Have you noticed over the past several years seeing fewer and fewer fireflies? Or maybe you call them lightning bugs? They were always such a delight when I was a kid seeing them light up and chasing after them.

photo by Radim Schreiber.

Fireflies are a type of beetle and there are over 150 different species in the United States alone with Britannica reporting over 2,000 species worldwide.

And here’s more from pestworld.com.

Prairie Moon Nursery, a native seed company based in Minnesota,  wrote a little something about fireflies and how we can attract them back to our backyards!

front garden from porch 7-10-22 – there is another Joe Pye weed on the left side of the sidewalk – grasses, coneflowers – ALL are great for fireflies
photo by Radim Schreiber

Native plants are key in providing habitat. Fireflies like moisture – add natives suited to wet soil such as those near streams and lakes, woodland edges, and even ditches and my own rain garden!

Rain garden 7-10-22 –

Tall native grasses often thrive in wetter soils; the grass blades provide narrow hiding places and long launch pads to take flight.

From a short, broad-leaved native wildflower to the canopy of a tall native tree, fireflies need this diversity of height to take shelter and safely lay their eggs.

Grasses ‘Karl Forester’ and a switch grass by Teri Knight

Native plants in turn enrich the soil with leaf litter, inviting the soft-bodied insects that firefly larvae feed on. The Xerces Society has offered up a list of native plants along with more information as to the WHY of seeing fewer fireflies or Lightning bugs!

From the article: The main threats to firefly populations worldwide include habitat degradation and loss, light pollution, pesticide use, poor water quality, climate change, invasive species, and over-collection. In the United States and Canada, habitat loss and degradation, light pollution, and climate change (in particular, associated drought and sea level rise) appear to be some of the primary drivers of decline. Pesticide use is suspected to play a major role as well.

As population grows, there are fewer and fewer areas of land that offer shelter from light pollution. As humans try to protect our species with more street lights, we step over the needs of other species that need less light. And, in fact, we lose our sight on nature. Larvae and flightless adult females are likely the most vulnerable to pesticides because they are relatively immobile and unable to disperse away from treated sites.

Check out this plant list from firefly.org.

Asters in butterfly garden 2019 – fireflies dig this plant too