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Invasive Plants or Trees
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Updated: August 5, 2022
Invasives in your Woodland: Porcelain-berry
Porcelain-berry is a deciduous, climbing, woody vine introduced from northeast Asia in the 1870s. It became popular for its tolerance of adverse conditions and its ability to provide ground cover. However, it is an aggressive plant that invades damp, shady areas such as streambanks, forest edges, pond margins, and disturbed areas, and forms dense mats that crowds out native vegetation.
Updated: August 4, 2022
Invasives in Your Woodland: Lesser Celandine
Lesser celandine can be an ecological threat. It was introduced to the United States as an ornamental plant in the late 1800s. Although its sale was banned in Maryland in 2017, it may still be available for sale in other states.
Updated: July 22, 2022
Branching Out - Spring 2022
Read about some of the changes to the Woodland Stewardship Education program and News and Notes about stories you might have missed. Our regular features include the Woodland Wildlife Spotlight and Invasives in Your Woodland, and the Brain Tickler challenge.
Updated: July 8, 2022
Invasives in Your Woodland: Garlic Mustard
Garlic mustard is a biennial flowering plant in the mustard family that is an aggressive invader of woodlands throughout the United States.
Updated: May 11, 2022
Invasives in Your Woodland: Johnsongrass
Afforestation is the process of planting trees in formerly open space. Because trees take time to mature, it is important to ensure that the seedlings have sufficient light and nutrients to grow. This often involves controlling growth of other species within the planting area, including invasive species such as the distinctive Johnsongrass. And once established in an area, Johnsongrass can out-compete many other species for nutrients and over-top them to rob them of sunlight.
Updated: May 11, 2022
Invasives in Your Woodland: Canada Thistle
Canada Thistle is also known as creeping thistle, as well as green or perennial thistle, depending on the source. Others express their opinion about it by calling it hard thistle and cursed thistle. Canada thistle is an aggressive and colonial perennial, with both male and female plants. It is considered a noxious weed in Maryland and many other areas across the U.S.
Updated: May 4, 2022
Invasives in Your Woodland: Japanese Privet
Japanese privets are less common than other privets that are more widespread across the eastern U.S. Reported sightings in the mid-Atlantic are sparse, but it may be more widespread, based on its continued use in landscaping.
Updated: May 4, 2022
Invasives in Your Woodland - Winged Euonymus
Winged euonymus is not widespread in the mid-Atlantic. Its greatest reported infestations are in the Midwest and Northeast. It has been found in much of central and southern Pennsylvania, far northern Delaware, southwestern Virginia, north-central West Virginia, and the greater Washington DC area.
Updated: May 4, 2022
Invasives in Your Woodland - European Buckthorn
European buckthorn is a native of Europe and was introduced here as an ornamental plant, perhaps as early as the late 1700s. In the 1900s, it was planted widely to form living fence rows and for wildlife habitat. Since then, it has spread aggressively into a variety of environments.
Updated: May 4, 2022
Invasives in Your Woodland - Butterflybush
Butterflybush is a rarity among non-native, invasive species. It has a wide variety of cultivars and a wide range of supporters among retail outlets as well as some environmental observers. It is also benefitting from positive public relations related to the decline of butterflies. However, it is indeed invasive, and contributes to (rather than mitigates) the decline of pollinators.
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