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Kim Eierman

Kim Eierman

Founder of EcoBeneficial!

Available for virtual and in-person landscape consulting, talks and classes.

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Powerful Prunus: A Visit With Dr. Doug Tallamy

Some of our most ecologically powerful native plants are the ones we never plant!   It’s time for a change, if we really want to make a difference to our environment.

Often considered a “weedy tree”, our native Black Cherry (Prunus serotina) is an extraordinarily valuable plant in nature.   Native to most of the Eastern half of the U.S., Black Cherry offers nectar and pollen to native pollinators and honey bees.  The small red or black fruits are a favorite food of more than 40 species of birds, not to mention, many mammals.

Black Cherry also serves as the host plant for an amazing array of butterflies and moths – more than 450 species, including: Eastern Tiger Swallowtail, Cherry Gall Azure, Viceroy, Columbia Silkmoth, Promethea Moth, Small-eyed Sphinx Moth, Wild Cherry Sphinx Moth, Banded Tussock Moth, Band-edged Prominent, Spotted Apatelodes and Red-Spotted Purple.

I had the opportunity to visit with noted entomologist, ecologist and author, Dr. Doug Tallamy, about native Black Cherry and related Prunus species.  As we looked around his yard, Tallamy pointed out the many Black Cherry saplings that had “volunteered” in his landscape.   These plants and other native Prunus are ecological gold explained Tallamy – his #2 ecological plant pick after his top ecological choice – native oaks.

Within seconds, Tallamy located numerous caterpillar larvae on the small black cherry saplings – Tiger Swallowtails and Red-Spotted Purples among them.  Why so many caterpillars on these little plants?  Tallamy explained that caterpillars may preferentially seek out smaller woody plants that offer predator-free space.  Lesson learned?  Make sure to keep some of those host plant volunteers if you want a more butterfly and moth-friendly landscape.  Of course, if those Black Cherry saplings are within a few feet of your house, like Tallamy’s, you will have to transplant them sooner rather than later.  Black Cherry trees can grow to 75 feet or more in height.

These tardy caterpillars were still feasting on Black Cherry saplings in September – clearly too late in the season to get through metamorphosis.  So, what do they do?  They overwinter in a self-made silky structure attached to their host plant, what Tallamy calls their “silk winter castle.”  These winter castles are actually hibernaculum – shelters occupied during the winter by dormant animals, according to Miriam-Webster.

Even with a winter castle, how in the world can these tiny, juicy caterpillars get through the cold winter months and plunging temperatures?  Their secret is glycerol in their blood – essentially a form of anti-freeze.   For those of you considering some woody plant pruning during dormant winter months – be aware that you might inadvertently dispatch some valuable caterpillars – so look twice before you cut.

If you don’t have room for Black Cherry, or it is not native to your region, we have other native Prunus species. Most are host plants, all have value to pollinators, all offer fruit to wildlife, and some even have fruit tasty enough for us.  Beach Plum and American Plum are particularly good.  Don’t eat Prunus seeds, though, as they contain toxins.

Here are some of our native Prunus:

Prunus americana (American Plum)
Prunus andersonii (Desert Peach)
Prunus angustifolia (Sandhill Plum)
Prunus caroliniana (Cherry Laurel)
Prunus emarginata (Bitter Cherry)
Prunus gracilis (Oklahoma Plum)
Prunus maritima (Beach Plum)
Prunus mexicana (Bigtree Plum)
Prunus minutiflora (Texas Wild Plum)
Prunus nigra (Canada Plum)
Prunus pensylvanica (Pin Cherry)
Prunus pumila (Sand Cherry)
Prunus texana (Texas Plum)
Prunus virginiana (Chokecherry)

Skip the useless, sterile, exotic double-flowered cherry trees and take a tip from Dr. Doug Tallamy – plant our native Prunus!  Watch the video or listen to the podcast of my talk with Tallamy on Black Cherry.  And, don’t forget to pick up a copy of his ground-breaking book, Bringing Nature Home.

From Kim Eierman at EcoBeneficial!

Photo: Flowers of Prunus serotina (Black Cherry)
Photo credit: Ken Cheeks_Flickr


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