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In some areas, Bohemian knotweed is classified as an invasive species and a noxious weed. It is illegal to transport and sell in multiple US states, including Minnesota, [1] Washington, [5] and Wisconsin. [6] Mechanical control and hand pulling are ineffective. Repeat herbicide application through spraying leaves and injecting stems is the best ...
Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a species of herbaceous perennial plant in the knotweed and buckwheat family Polygonaceae. [1] [2] Common names include Japanese knotweed [2] and Asian knotweed. [3] It is native to East Asia in Japan, China and Korea.
Polygonum arenastrum, commonly known as equal-leaved knotgrass, [2] is a summer annual flowering plant in the knotweed family Polygonaceae.Other common names include common knotweed, prostrate knotweed, mat grass, oval-leaf knotweed, [3] stone grass, wiregrass, and door weed, as well as many others.
For perennial weeds, it's best to apply a weed killer when the weather begins to cool down after the intensity of summer. "If you are going to use a control product, ...
Ammonium sulfamate is considered to be particularly useful in controlling tough woody weeds, tree stumps and brambles.. Ammonium sulfamate has been successfully used in several major UK projects by organisations like the British Trust for Conservation Volunteers, English Heritage, the National Trust, and various railway, canal and waterways authorities.
Japanese knotweed is seen in flower. Yellowish-white flower spikes appear in August and September, making now the best time of year to identify and report occurrences of this invasive species.