1. It‘s called knotweed and is originally from Japan.

2. The number one spot is taken by Japanese knotweed.

3. Japanese Knotweed is causing structural damage to buildings and roads, after forming dense vegetative layers that stop native flora germinating.

4. Only four introduced species, including game birds such as pheasant and red–legged partridge, are considered to bring any economic benefit; while many others, such as the Chinese mitten crab, American mink and Japanese knotweed, are known to have harmful economic and biological consequences.

5. Japanese Knotweed has topped the list of invasive species Headlines The 48m divorce Impoverished Romanians healthier than Brits ‘Score card‘ will predict chances of developing dementia Blair saddles Brown with 15bn ID cards through manifesto pledge Anti–terror raid shooting ‘was an accident‘ The square melon, coming to a store near you The pupils scared of being told they‘re clever Championships in jeopardy amid conker shortage Top threats to British countryside named Teen in horror fall has happy landing...on top of friend The paddle pool police banned me from taking family snap Problem of perfect boiled egg solved – without water!