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knotweed

   Also found in: Medical, Wikipedia 0.02 sec.
knot·weed  (ntwd)
n.
Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers.

knotweed [ˈnɒtˌwiːd]
n
(Life Sciences & Allied Applications / Plants) any of several polygonaceous plants of the genus Polygonum, having small flowers and jointed stems


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One couple, for example, had established a safe campsite by burrowing deep into a large stand of Japanese knotweed, a bushy, invasive plant in New England that was originally introduced to hide outhouses.
Most web people class it on a par with Japanese knotweed.
Excess moisture also promotes the seed germination of weeds that later persist even when conditions turn drier, such as knotweed, goosegrass, buckhorn plantain, dandelion and white clover.
 
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