May Invasive: Japanese Knotweed

May 5, 2015 by

 This shows what a Japanese Knotweed plants look like now, they are about 4 feet high.


This shows what a Japanese Knotweed plants look like now, they are about 4 feet high.

Japanese Knotweed (Fallopia japonica)  a truly noxious invader probably introduced in the late 1800’s as an ornamental plant.  It grows fast and spreads far and wide through its root system and seed dispersal altering the natural ecosystem by excluding natural plants.  It also a contaminant in fill and topsoil.  Once you know what it looks like you will see it all over town.Small patches can be dug up provided none of the roots are left behind to resprout.  Larger patches can be cut and all plant material bagged and disposed of in the trash. Repeated cutting is necessary during the growing season to prevent seed formation.  Uncut these plants can grow up to 10 feet tall.  Spraying with a herbicide like Roundup is not recommended in the spring.  Cutting in the fall, before the ground freezes, and immediately (within minutes) applying Roundup to the cut stems is best.

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