With most of the snow melted and the ground warming up, many people are getting a head start on preparing their yards for planting and landscaping by clearing brush and dead plant material from last year. For others, many are preparing their yard for landscaping for the first time as new home owners/renters, possibly dealing with unknown plants and vines. Before you cut or clear away any brush, make sure you know what you are removing. Many invasive species may look like they are dead on the surface, but, they are very much alive. Cutting, mowing and pulling untreated brush may result in an even larger infestation during the summer season. If you see tall stalks that are hollow, they might be Japanese knotweed. This species of plant grows aggressively and has the potential to damage sidewalks, driveways and the foundation of buildings. To effectively manage Japanese knotweed, it is important to understand the growing cycle of the plant. Japanese knotweed is a perennial shrub that has an extensive underground rhizome system (essentially an underground horizontal root system). During the spring, the rhizomes send up shoots that will grow through the leaf litter, often looking like asparagus. When the growing season ends at the end of summer, the plant begins to redistribute its energy towards its roots in order to prepare for its dormancy period. It is at this time herbicide treatment efforts should be implemented for maximum effectiveness. During winter, the above ground vegetation turns brown and brittle, as is shown in the picture below. If the Japanese knotweed has not been treated, do not cut or mow the stalks as it may stimulate the roots and rhizomes to send up more shoots. It is important to note that even a small fragment of root or rhizome can become an established plant, and all loose pieces should be landfilled in lieu of composting. For more information on how to manage Japanese knotweed, please click here for DNR best management guide.
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AuthorShikha Singh is the coordinator for the JLW CISMA. She has a BSc. in Biology from University of Western Ontario, and her master's and PhD at Michigan State University from the Dept. of Fisheries and Wildlife. Her areas of expertise include water quality, water policy, invasive species, education/outreach and public speaking. |