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Updated: August 26, 2024
Introduction to Invasive Plants in Maryland
What are invasive plants and why are they a problem? Here are examples of invasive plants and their impact on people and wildlife.
Updated: July 7, 2025
Invasives in Your Woodland: Lesser Celandine (Updated 2025)
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: June 26, 2025
Invasives in Your Woodland
Since its debut as a regular Branching Out feature in 2016, "Invasives in Your Woodland" has profiled a wide variety of invasive plant species that threated the health of Maryland's ecosystems.
Updated: June 26, 2025
Invasives in Your Woodland: White Mulberry
The white mulberry reached our shores during the colonial period. This invasive plant is found in every Maryland county.
Updated: June 25, 2025
Invasives in Your Woodland: Johnsongrass (updated 2025)
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: June 25, 2025
Invasives in your Woodland: Porcelain-berry (updated 2025)
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: June 24, 2025
Invasives in Your Woodland: Tree-of-Heaven (Ailanthus) (Updated 2025)
Tree-of-heaven has been receiving a significant amount of attention lately, and not just because it is a fast-spreading invader of woodlands throughout the mid-Atlantic states and beyond. the recent discovery of a new invasive insect in Pennsylvania, and its subsequent spread into adjoining areas, has lent new voice to advocates for the plant’s removal. Spotted Lanternfly, a recent arrival from Asia prefers tree-of-heaven as its host. This has led to an increased movement to remove tree-of-heaven from the landscape.
Updated: June 24, 2025
Invasives in Your Woodland - Winged Euonymus (updated 2025)
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: June 23, 2025
Invasives in Your Woodland - Butterflybush (updated 2025)
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.
Updated: June 23, 2025
Invasives in Your Woodland: Japanese Knotweed (updated 2025)
Japanese knotweed is an upright, shrubby, herbaceous perennial plant that can grow to over ten feet in height. It commonly invades disturbed areas with full or mostly full sunlight, such as roadsides. However, it can tolerate shade, as well as high temperatures, high salinity, and drought.
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