4 Invasive Weeds in the UK You Should Know About (That Aren’t Japanese Knotweed)
While Japanese knotweed often takes the headlines, a number of other invasive species are quietly taking residence across the UK, threatening native ecosystems and even public health. Invasive weed removal specialists, Environment Controls, urge the public to be on the lookout for four particular plants.
Gaultheria shallon (Shallon or Salal)
First on the list is Gaultheria shallon. Environment Controls recently discovered a significant infestation of this invasive evergreen shrub during a customer survey. Although not toxic, shallon is highly aggressive, forming dense thickets that can outcompete native plants and prevent tree regeneration in forests, particularly in the South of England. Furthermore, for residents in Scotland, it’s now a criminal offence to plant or allow this species to grow in the wild under the Wildlife and Countryside Act.
Tree of Heaven (Ailanthus altissima)
This fast-growing tree is native to China but is now common across the UK. It’s known for releasing a strong, unpleasant smell and can cause serious issues with its roots. The aggressive root system of a Tree of Heaven can damage building foundations, drains, and sewers, making it a serious concern for homeowners.
Meanwhile, Ragweed poses a significant health risk. This is one to watch out for if you suffer from hay fever. Ragweed produces billions of pollen grains, making it a major cause of hay fever in late summer and autumn. According to Environment Controls, the allergies it causes can be so severe they may even lead to asthma.
Devil’s Trumpet (Datura stramonium)
Also known as Thorn Apple, this highly poisonous plant is a major danger. All parts of the Devil’s Trumpet plant are toxic to both humans and animals. If ingested, it can cause severe health issues, including visual and auditory hallucinations and confusion. It should never be handled without proper protective equipment.
Jennifer Holmes from Environment Controls said: “Most people think of plants such as Hemlock as being a threat to human health, as it’s highly toxic if ingested, but there are many other plants that can cause allergic reactions or are harmful both to man and the environment, including the ones listed in this article. It’s wise to consult a professional if you’re not sure what a plant is – our free online ID tool is quick and easy to use. In general it’s good to be aware of the ones to watch out for especially if you’re a forager!”
Environment Controls advise anyone who spots any of these non-native plants not to try and remove them themselves, as this can often lead to further spread. The most effective control is typically professional herbicide treatment and removal.
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