Invasive Herbaceous Plants

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Updated: September 16, 2021

Weed Identification Photos

Identify common Maryland weeds by growth habit.
flowering ground ivy
Updated: July 15, 2021

Introduction to Invasive Plants

What are invasive plants and why are they a problem? Here are examples of invasive plants and their impact on people and wildlife.
invasive english ivy vines climbing up a tree
Updated: August 31, 2021

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: August 31, 2021

Invasives in Your Woodland: Japanese Knotweed

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.
Japanese knotweed plants and flowers.  Photo by Britt Slattery, US Fish & Wildlife Service
Updated: August 31, 2021

Invasives in Your Woodland: Kudzu

Kudzu is a deciduous, climbing, semi-woody perennial vine that grows 35 to 100 feet long. It grows via runners, rhizomes, and from nearly every node that touches the ground. It spreads most rapidly in open areas, including disturbed areas such as abandoned fields, roadsides, and forest edges.
Kudzu infestation. Photo by Chris Evans, University of Illinois, bugwood.org
Updated: August 31, 2021

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.
Garlic mustard plants and flowers.  Photo by Ansel Oommen, Bugwood.org
Updated: August 30, 2021

Invasives in Your Woodland: Multiflora Rose

Multiflora rose is one of the most common invasive plants in the mid-Atlantic region. Read how to identify it, how to keep it from spreading, and how to keep it in check.
Multiflora rose plants and flowers. Photo by Rob Routledge, Sault College, Bugwood.org
Updated: August 26, 2021

Invasives in Your Woodland: Wavyleaf Basketgrass

Wavyleaf basketgrass was first identified in the United States in Baltimore County, MD in 1996. It is less well-known than other invasives, but it is spreading rapidly in Maryland and Virginia.
Wavyleaf basketgrass
Updated: August 26, 2021

Invasives in Your Woodland: Japanese Stiltgrass

Japanese stiltgrass has successful invasive has colonized a variety of habitats throughout the eastern half of the United States, including every county in Maryland, and reaching as far west as Texas.
Japanese Stiltgrass
Updated: August 25, 2021

Invasives in Your Woodland - Mile-a-minute

Mile-a-minute is a vigorous invasive that may only have just begun to spread in the United States. One estimate surmises that it is only found in 20% of its potential range in this country.
Mile-a-minute plants. Photo by Richard Gardner, UMES, Bugwood.org