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:
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.
This Mugwort grove in Douglas Park is approximately 200 ft. long; it is west of the playground and disappears into the forest.
Asian Stilt Grass can be found along the trail in Douglas Park and was brought there via landfill.
Photos by Barbara Carr
Please click the links below for factsheets about other local invasives:
From the Native Plant Center at Westchester Community College: