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Invasive Woody Plants
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Invasive Woody Plants
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Updated: November 5, 2024
Weed Identification Photos in Maryland
Identify common Maryland weeds using our extensive collection of photos.
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: February 22, 2023
Invasive Species
What are invasive species? How to identify invasive plants, insects, and diseases and how to manage them in the landscape.
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 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 18, 2025
Invasives in Your Woodland: Japanese Honeysuckle (Updated 2025)
Japanese honeysuckle grows in a variety of habitats, including woodlands, wetlands, and disturbed areas, such as fence rows, roadways and rights-of-way. It is shade-tolerant and often smothers and kills native ground-level vegetation. It can also kill shrubs and saplings by girdling.
Updated: June 17, 2025
Invasives in Your Woodland: Oriental Bittersweet (updated 2025)
Like many invasive plants in North American woodlands, Oriental bittersweet is a strong competitor for light and nutrients in a variety of disturbed landscapes. It can be found along roadsides, in fallow fields, and in woodlands that have been recently harvested.
Updated: June 17, 2025
Invasives in Your Woodland: Callery Pear (updated 2025)
Drive along many of Maryland’s major roads in the spring, and you will see what seems like a wall of white, as the Callery pear (and its offshoot, the Bradford pear) are in bloom. While these may be an impressive sight, these trees are an invasive and highly competitive species.
Updated: June 16, 2025
Invasives in Your Woodland: Norway Maple
The Norway Maple is so conspicuous throughout the United States that it is often easy to forget that it is an introduced species that can adversely affect the environment.
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