Guide to Invasive Plants

Invasive plants are varieties of non-native plants that can grow uncontrollably and choke out local plant varieties. There are several varieties of invasive plants found in Sleepy Hollow:

Japanese Knot Weed

Japanese Knot Weed

Japanese Knot Weed Grove in Douglas Park

Japanese Knot Weed Grove in Douglas Park

This Japanese Knot Weed grove in Douglas Park is more than 100 ft. long and 50 ft. wide. For reference, the man pictured is 5’9″.

According to the World Conservation Union, Japanese Knotweed is one of the “World’s Worst Invasive Alien Species.” Because of its underground stems and roots, known as rhizomes, it can be quite difficult to eliminate. Communities have been trying to control its spread through careful cutting and herbicide application, but some are also experimenting with releasing insects that feed on Japanese Knotweed. Check out the Japanese Knotweed Alliance for more information on this invasive plant and methods for controlling it.

Mugwort Plant

Mugwort Grove in Douglas Park

This Mugwort grove  in Douglas Park is approximately 200 ft. long; it is west of the playground and disappears into the forest.

Invasive Grass Asian Stilt Grass

Invasive Grass Asian Stilt Grass in Douglas Park

We need help identifying this invasive grass! It can be found along the trail in Douglas Park and was brought there via landfill.

If you know what it is, please email us at sleepy.hollow.eac@gmail.com.

UPDATE: It has been identified as Asian Stilt Grass. Thanks for your help Susan A.!

 

For more practice with identifying invasive species, click here for info about a workshop on identifying hydrilla, an aquatic invasive plant. It will be run by the New York New Jersey Trail Conference at Teatown Lake Reservation on September 11, 2014.

 

Photos by Barbara Carr

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