Invasive Plants

What is an Invasive Species?

Invasive species are non-native species that can cause harm to the environment, the economy or to human health. Invasives come from all around the world. As international trade increases, so does the rate of invasive species introductions. Invasive species are one of the greatest threats to New York's biodiversity. They cause or contribute to: habitat degradation and loss; the loss of native fish, wildlife and tree species; the loss of recreational opportunities and income; and crop damage and diseases in humans and livestock (from the New York Dept. of Environmental Conservation).

Japanese knotweed

Japanese Knotweed

This bamboo-like plant is shade-tolerant and grows from 3 to 15 feet tall, in disturbed areas, often near water sources.

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Multiflora rose2

Multiflora Rose

Currently found in 41 states, this flowering shrub is classed among the top forest invasive plant species for the northeastern area by the US Forest Service.

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Giant hogwood2 800x400

Giant Hogweed

Giant hogweed is one of New York's most striking and dangerous invasive plants. Learn how to recognize and manage it safely on our site.

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Black swallowwort

Swallow Wort

Areas that have been cleared of swallow-wort should be planted with rapid-growing native species to avoid introduction of other invasive plants.

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Garlic mustard

Garlic Mustard

Garlic mustard is one of very few non-native plants to be able to successfully invade forest understories.

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Bush honeysuckle

What are those berries?

Exotic bush honeysuckle is perhaps the most widespread exotic invasive in the U.S. Widely dispersed by birds, it is now found in at least 38 states.

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Last updated March 9, 2017