The Flowers of Evil: Deceptively Beautiful Invasive Plants

“Folly and error, sin and avarice
Labor our minds and bodies in their course.
Gaily we nourish our pleasurable remorse
As beggars feed their parasitic lice.”

Charles Baudelaire in Les Fleurs du Mal, translated by Jacques LeClercq.

The deceptive beauty of nature has been written about extensively by poets. While some flowers are wild and unruly, stubborn like weeds and a visible blight, others are extraordinarily beautiful – and evil.

Historically, gardeners have pursued aesthetic perfection with a passion that borders on obsession. The sprawling estates of the Victorian era, or even the meticulously designed landscapes of the mid-twentieth century often come to mind. Along with this tendency towards perfection came a posturing mentality that brought exotic treasures from distant continents into suburban backyards. The Victorian fascination with the rare and striking often blinded gardeners to the inherent dangers of introducing foreign species. Regrettably, those species have become deceptively destructive, strangling native wildlife habits with thickets of noxious greenery. 

Here are a few proverbial “flowers of evil” and how you can replace them with stunning, responsible alternatives in your garden.

If you are currently dealing with an infestation, a hori hori knife is the ultimate tool for eliminating invasive plants. Its sharp, serrated blade allows you to dig deep, slice through unforgiving, woody taproots, and lever out entire root systems to prevent them from growing back. Pair with other hand tools for a fruitful gardening season. 

 

1. Purple Loosestrife

Supermarket or mainstream nurseries tend to prioritize instant, bright color, often ignoring the ecological havoc a plant can wreak when it escapes cultivation. At first glance, a wetland blanketed in vibrant spikes of purple loosestrife looks like an Impressionist masterpiece. But while it may seem that the frogs are about to perform a concerto beneath the water, purple loosestrife has catastrophic consequences to wetland ecosystems. 

As it becomes established, purple loosestrife chokes out native wetland vegetation such as cattails and rushes. This creates a dense, impenetrable monoculture that threatens wildlife. Frogs and toads, whose aquatic pathways become completely blocked by the plant’s woody, intertwined root systems, are definitely not having fun. Blazing star (Liatris spicata) and joe-pye weed (Eutrochium purpureum) are excellent alternatives, providing striking purple spikes that feast on moist soils while serving as a paradise for native pollinators.

2. Japanese Honeysuckle

Japanese honeysuckle covers surfaces with formidable efficacy, tricking gardeners into thinking they’ve found a plant that doesn’t die on them, but behind its reliable facade is a ruthless invasive species. This aggressive climber utilizes a dual strategy of destruction, forming dense mats along the forest floor. Simultaneously, it climbs upward, choking off the flow of nutrients and water until the host plant perishes. Coral honeysuckle (Lonicera sempervirens) is a spectacular native vine that serve as a primary magnet for ruby-throated hummingbirds. Plant in raised garden beds along with trellises for an instant injection of color.  

3. English Ivy

English ivy, as both a groundcover and a climber, is seen as a timeless, classic symbol of academic prestige and historic estate charm. However, its true insidious nature operates on two fronts: as a sub-canopy groundcover and as an arboreal vine. On the ground, it forms vast, sterile carpets that exclude all native wildflowers and ferns. When it climbs, its adventitious roots secure it tightly to tree bark. It adds immense weight to the tree canopy, making the host vulnerable to blow-downs during storms, while potentially harboring harmful bacterial associated with bacterial leaf scorch. Ostrich ferns provide excellent shade, while Virginia creeper emulates English ivy’s creeping nature.

4. Kudzu

Known notoriously as "the vine that ate the South," kudzu has cemented itself firmly in the southern landscape with its famous spectacles of greenery. In the decades following its introduction at the 1876 Centennial Exposition, it was widely promoted for erosion control, a move that led it to spread aggressively, reducing entire landscapes to blobs of singular green. Kudzu can grow up to a foot a day, scaling trees, power poles, and entire buildings. It kills other plants by completely smothering them, blocking out the sunlight required for photosynthesis. In the end, it leaves behind a surreal, uniform landscape of green mounds – apocalyptic to some, paradoxically calming to others. A relatively inexpensive way to implement similar lush foliage without it aggrandizing your yard is to plant native porcelain berry or Dutchman’s pipe. 

5. Butterfly Bush

Capitalizing on its stolid spires of blooms, butterfly bush was marketed for decades as a paradise for wildlife – a conservationist’s shortcut to a thriving backyard sanctuary. The grim reality is that its highly regenerative abilities have allowed it to establish a tenuous grip on stream banks. While it feeds adult butterflies with sugar water, not a single native caterpillar species can eat its leaves.

A relatively inexpensive way to support local pollinators responsibly is to plant native sweet pepperbush or New Jersey tea. Another option is to plant noninvasive butterfly bushes such as Blueberry Pie™, which have specifically been bred to be non-invasive and sterile, producing virtually no viable seeds. Unlike traditional butterfly bushes, this dwarf hybrid poses no threat to the local ecosystem. 

6. Chinese Wisteria

Chinese wisteria is undeniably beautiful, but its nature is inherently destructive, with a tendency to strangle mature trees, topple wooden structures, and damage home siding.

It’s been known to engulf pine trees, and it’s a beautiful sight while it lasts – the tree’s branches are laden with frothy lilac blooms, almost like a paradisiacal Christmas tree. Sooner or later, though, the tree will snap under its weight, and the purple-flowered holiday illusion will crack. Wisteria grows in a clockwise or counter-clockwise spiral to gradually constrict the trunk of the tree, effectively acting like a slow-motion tourniquet. 

Wisteria leaves are broad and fast-growing. They will eventually cover the needles of the Christmas tree, stealing all the sunlight. Even if the tree is sturdy, the wisteria will eventually turn it into a “ghost tree” – a dead skeleton of pine needles held upright by the very vines that killed it.

7. Callery Pear

Suburban street trees tend to be selected for their uniform shape and quick growth, rushed into production to line newly built neighborhoods. Callery pears have long served as a favorite for developers, bursting forth in a blizzard of white come spring. But it’s one of the worst offenders on the list, with a fetid scent reminiscent of the gutted remnants of dockside fish. It has mastered chemical warfare by releasing a chemical that suppresses other plant species and poses a significant threat to native flora.