A publication of Appalachian Voices

A publication of Appalachian Voices

This Green House

Beware of Spreading These Common Invasive Species

Japanese Honeysuckle

Although Japanese Honeysuckle is a popular ornamental plant, it can easily invade areas disturbed by human activity and out-compete native flora. Photo by Kumiko

By Carolina Norman

Many invasive species are hiding in plain sight at plant nurseries, waiting for unsuspecting gardeners to scoop them up and bring them to a new yard from which to spread. The Southeast harbors some of the most biodiverse ecosystems in the country, but plants introduced by humans threaten the region’s ecology as they encroach on native plant species.

Invasive plants are often characterized by fast growth rates, efficient seed dispersal and rapid germination. They are especially problematic in human-disturbed areas because they often take hold faster than native species. Aggressive invasive species block the amount of sunlight, water, nutrients and space native plant species are able to get. Without natural checks, invasive species can crowd out other plants, diminishing biodiversity and limiting the food available to wildlife.

Below are some of the most common invasive species sold in garden centers. Avoid introducing these into your yard and local ecosystems.

Callery “Bradford” Pear Tree
Pyrus calleryana
Widely used for landscaping in residential areas and appealing for its white blooms in spring, this tree will invade disturbed areas and displace native species, often shading them out. The Callery pear can germinate and grow rapidly, making it an especially aggressive competitor. Photo: Lee Coursey

English Ivy
Hedera helix
English ivy is a popular groundcover and is swallowing woodlands and deteriorating structures. This highly adaptive species can cover trees such as maples, oaks and elms. English ivy grows from the ground up into tree canopies, impeding photosynthesis and weighing down treetops, increasing the risk of trees blowing down during storms. Photo: Luke McGuff

Japanese HoneysuckleJapanese Honeysuckle
Lonicera japonica
Popular for its sweet-smelling blooms, this vine can form dense mats, invading forest floors and creeping into tree canopies where it shades everything below. Japanese honeysuckle encroaches on habitats such as wetlands, forests, roadsides and disturbed areas. Photo: Kumiko

Japanese & Chinese WisteriaJapanese & Chinese Wisteria
Wisteria floribunda & Wisteria sinensis
Despite its weedy and destructive habits, wisteria is widely sold and planted. This species climbs trees, shrubs and structures, smothering and shading out native species. Japanese and Chinese wisteria also cut through bark, killing trees as it twists around their branches. Photo: mrhayata

Multiflora RoseMultiflora Rose
Rosa multiflora
This rose’s sweetly scented blooms make it attractive for landscaping — but once it spreads, this species forms thorny, impenetrable thickets in fields and forest edges, restricting livestock and wildlife movement and displacing native vegetation. The multiflora rose easily adapts to a variety of habitats, making it especially threatening to native plants. Photo: Andreas Rockstein

Oriental BittersweetOriental Bittersweet
Celastrus orbiculatus
A woody vine coveted for its clusters of distinctive red seeds, Oriental bittersweet can climb up to 60 feet into tree canopies and colonize forest edges, roadsides and meadows. This vine rapidly forms dense thickets and has a diverse range, threatening a variety of native species from the ground to the tree canopy. Photo: Jeffrey Shultz

Princess TreePrincess Tree
Paulownia tomentosa
A rapid-growing tree, appealing for its fragrant purple blooms, the princess tree often appears along roadsides, stream banks and forest edges. Often invading following a fire or human disturbance, this tree can adapt to a variety of habitats. Photo: Kumiko

Sweet Autumn VirginsbowerSweet Autumn Virginsbower
Clematis terniflora
With small, white blooms, this attractive vine is frequently sold in nurseries. Sweet autumn virginsbower invades forest edges and urban areas along streams and roads. It grows into dense blankets, covering native species and blocking light from reaching the plants underneath. Photo: Kit Case

Winged Burning BushWinged Burning Bush
Euonymus alatus
This popular plant, widely sold for its hardiness and intense red foliage in fall months, forms dense thickets that can displace many native plant species. Instead, opt for a similar variety of this species that is not invasive, Euonymus alatus ‘Compactus.’ Photo: Jack Pearce

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2020 — Spring

2020 — Spring

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