Japanese Knotweed
Polygonum cuspidatum (Fallopia japonica)
Japanese knotweed is an invasive weed that threatens native plant habitats. More on this topic from Invasive Plant Atlas of New England.
Japanese knotweed
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Japanese Knotweed, Mexican Bamboo, Reynoutria
Scientific Name: Polygonum cuspidatum Sieb. & Zucc.
Synonym: Fallopia japonica, Pleuropterus zuccarinii, Polygonum zuccarinii, Pleuropterus cuspidatus, Polygonum japonicum, Reynoutria japonica ...
Japanese Knotweed
Scientific name: Fallopia japonica (Houtt.) Ronse Decr.
Synonym: Polygonum cuspidatum Siebold & Zucc.
Japanese knotweed is designated a noxious weed in the State of Washington.
Japanese knotweed
Also known as Quebec or Mexican bamboo (Fallopia japonica, syn.Polygonum cuspidatum), quickly reaches 120 to 180 centimetres and forms a dense, arching silhouette with tiny, pink to white flowers.
Japanese knotweed
Persicaria capitata
Scientific Name
Persicaria capitata (Buch.-Ham. ex D. Don) H. Gross ...
Jacob's Ladder, Japanese Knotweed, Jersey Cudweed, Jointed Rush, Juneberry, Juniper
Keeled Garlic, Kerry Lily, Kidney Saxifrage, Kidney Vetch, Knapweed Broomrape, Knotgrass, Knotted Bur Parsley, Knotted Clover, Knotted Pearlwort ...
Fallopia japonica [Japanese Knotweed, Mexican Bamboo] see Polygonum cuspidatum
× Fatshedera
Araliaceae ...
Variegated Japanese Knotweed [English]: Polygonum cuspidatum 'Variegata'
Variegated Japanese Knotweed [English]: Polygonum cuspidatum 'Freckles'
Variegated Japanese Mock Orange [English]: Pittosporum tobira 'Variegatum' ...
Persicaria polymorpha is sometimes confused with Polygonum cuspidatum or Japanese Knotweed, which is considered an invasive. I haven't seen anything to suggest that Persicaria polymorpha should be grown with caution, but please let me know if you do.
They may also be found growing under bracken or Japanese knotweed, perennial plants which also form stands with a dense summer canopy.
How to kill Ivy
How to kill Bindweed and Bellbind
Killing Japanese Knotweed
How to Kill Stinging Nettles ...
Imported plants, such as Japanese knotweed and Himalayan balsam, can also become invasive, eventually pushing out native species and altering habitats.
 See also: Knotweed, May, Grass, Green, Japonica
  
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