Good Intentions, Bad Outcomes - The Aesthetic Appeal (and Serious Problem) of Invasive Plants

June 9, 2022

 

Many alien-invasive plants, such as this Multiflora Rose (Rosa multiflora )which cause problems were originally imported for their aesthetic or practical value. Image copyright Daniel E. Levenson 2022.

In front yards and sidewalk cracks, at the edges of driveways and in overgrown garden beds, the plants one encounters on an afternoon walk in the suburbs can often provide clues about the history of land use. In some ways, the history of much of New England can be painted in broad strokes, with many subtle stories along the way.  From the different land use practices of indigenous people/first nations, to the arrival of Europeans who made major, often violent changes to delicate ecosystems in pursuit of profit as they turned wetlands, forests, and meadows into farm fields and the raw stuff of industry, until the centers of profit shifted once again and farms and pastures turned into subdivisions and cities, each change leaves its fingerprints on the land and waters around us.

Often, as I walk around my neighborhood and similar areas I find myself imagining what these places looked like in these earlier eras, when the world moved at a slower pace, when the sidewalk beneath my feet was once a dirt path winding through the woods, and the stone walls that criss cross the yards and conservation land once represented the boundaries of neighboring farms. These flights of imagination are interspersed with reminders of the more immediate impact of people on the land in the form of non-native ornamental and in some cases very invasive and damaging plants. All of this begs the question as to why people put these plants in their yards and gardens. Part of the reason, undoubtedly, is that as humans we find things that are both somewhat unusual and colorful, to be attractive and so people plant them without much knowledge of the natural history or environment of the organisms they are adding to the land. In some cases these ornamentals spread slowly and can coexist alongside native plants, while in others they spread rapidly, disrupting and damaging the ecosystem. Such plants escape cultivated land and spread with abandon, such as Multiflora Rose, an admittedly eye-catching plant with lovely white flowers. But of course appearances are deceiving in this case, and while the visual appeal of this plant is undeniable, its damage to native planet communities is also clear.

When it comes to mitigating the impact of alien invasive plants  in our present age we have some tools in place like import controls and state laws designed to limit the spread of these plants. But in some cases, alien invasives became established  decades or even centuries before such controls were in place, and in the case of Multifloras Rose, which arrived in the US sometime in the late 1700’s and was likely used initially for erosion control, this organism has had over 200 years to spread throughout the country. 

Beach Rose (Rosa Rugosa) can be found along coastal areas in much of New England. While it may add a nice pop of color to the dunes and beaches, this plant has gained a foothold in places where it has disrupted local ecosystems. Image copyright Daniel E. Levenson 2022

Multiflora Rose is not the only plant that was introduced with the best of intentions in the US, only to escape and prove less than benign. Another beautiful flower which has no place in our natural landscape is the Beach Rose (Rosa Rugosa), a plant I noticed for the first time while birding in Connecticut at Hammonasset Beach State Park. As I wandered along the sandy paths I stopped to take a number of photos of these beautiful flowers lining the walkways and nestled in among the dunes. Of course the spell was broken as soon as I used my plant ID app and discovered that it is the beauty of these plants which enticed horticultural enthusiasts into giving them a foothold in places like Connecticut and many other coastal areas of New England.

Even though I am under no illusion with respect to the changes that humans have made to the natural environment for thousands of years now, there is something about seeing so many plants out of place that I find particularly disheartening, perhaps because it reminds me of the profound (and extraordinarily dangerous, in the long run) disconnect that most people feel from the natural world. Fortunately, organizations like The Native Plant Trust in Framingham, MA and nurseries like Prairie Moon Nursery, which not only provide there actual plants that we can use to begin to restore our natural environment to some extent, but provide education and information that can help us to do in a sustainable and informed way.

And there are some places here I do find important native plants on my neighborhood walks, including Common Milkweed poking up beside an old stone wall each spring, and the clusters of litter white asters that I can count on each autumn. Seeing them does give me a little hope that these organisms can hang on, despite human neglect or interference, and if we give them and their kin a boost by encouraging people to plant natives and use organic methods, maybe we can not only restore some of the more crucial components of our native plant communities, but prevent the next wave of invasive plants from gaining a foothold in our environments.

Copyright Daniel E. Levenson 2022

Welcoming Beneficial Wasps Into the Garden

 

 

 

A Blue Mud Dauber among the Milkweed. Photo Copyright Daniel E. Levenson 2022.

 

June 3, 2022

One of the more delightful things about creating pollinator gardens, and generally replacing lawn grass or alien ornamental plants with native plants is that it’s not only butterflies and hummingbirds that show up, but a really interesting range of other types of pollinators which are perhaps less commonly noted by the casual gardener. As I’ve built up the native plant and pollinator gardens around my yard these last three years I’ve been endlessly fascinated not only with the  perhaps expected Ruby-Throated Hummingbirds that stop by on their daily rounds, or the Monarchs on the Milkweed, but by the range of other kinds of pollinators which are drawn to this little patch of native plants.

One of the first visitors I began to notice last summer once the Milkweed and Bee Balm was in bloom were two species of solitary wasps: Blue Mud Dauber (Chalybion californium) and Golden Digger Wasps (Sphex ichneumonea), both of which seem to be well-established in and around the back garden. These two species are generally not aggressive towards humans, but if you’re grasshopper in the case of the latter, or another species of mud dauber in the case of the former, it would be prudent to exercise caution: The Golden Digger Wasp hunts, paralyzes, and provides grasshoppers as food for their offspring inside a sealed tunnel, and the Blue Mud Dauber is known for finding its way into the nests of other species of Mud Dauber where, not unlike our local Brown-Headed Cowbirds with respect to other songbirds, it then removes the eggs of its near relative and leaves behind its own, using parasitism as a strategy for survival. Although I’ve yet to see these two creatures in the garden this year, my guess is it’s still a bit early, and as the Common and Swamp Milkweed in the garden move closer to flowering, these species of beneficial insects will once again be buzzing around the flowers.

Copyright Daniel E. Levenson 2022.

Woodrow Dines on The Deck

 

Our resident Woodchuck decided to try something new this evening, snacking on some potted violets on our back deck.

June 1, 2022

Some of the animals that show up in our yard are undoubtedly passing through, on their way to or from some other woodsy place in town. The doe and her fawns, the rowdy group of male Wild Turkeys, the coyotes we hear at night - they wander through on their way to somewhere else and we are content to see them as they appear. With others, though, we clearly share this little patch of suburban forest, and the dean of the hyper-local inhabitants is undoubtedly our resident Woodchuck, whom we have named Woodrow. Our first summer here Woodrow made regular appearances in the backyard during the day, munching on grass and other greens, waddling cautiously from one place to another in his little fiefdom, and then the second summer he was conspicuously absent. This spring Woodrow has appeared again with some regularity, and this evening he surprised us by climbing the few steps beside the back pollinator garden onto our deck, where he dined on some potted violets. It was hard to tell if he found them very palatable, for a minute or two into his meal he stood up, turned, and galloped, in a fashion, back toward his burrow beneath the shed.

Many people who covet picture perfect lawns curse the Woodchuck, and I admit, should Woodrow turn his attention to excavation close to the house I may need to have a serious conversation with him, but as a fellow inhabitant of this land, I enjoy watching him as he goes about his daily business, ambling through the grass in search of tasty things to eat.

Copyright Daniel E. Levenson 2022