News Top 10 Most Dangerous Weeds in the UK

  • 18/07/2018
  • 5 MIN READ

Top 10 Most Dangerous Weeds in the UK

With Britain’s love for gardens and plants, creative landscaping and modern garden design, it’s easy to understand how some of the most dangerous weeds in the UK are overlooked and go unnoticed on a daily basis.

With the changing weather climates and seasons, various plants bloom, grown and spread, there may be some seriously dangerous plants ahead. Many of them may look like plants growing beside others and, due to their colours and how then can blend in, many people take no real notice of them nor do they appreciate or understand what they really have on their property or in their garden beside their family and pets.

We are going to talk about ten of the most dangerous and invasive weeds that are found around the UK today that will require weed removal and treatment from our specialised team.

The Giant Hogweed

A highly invasive plant, damaging to both the health of humans and animals, it is commonly found along the banks of rivers and sources of water where it can grow out of control, overshadowing other plants and wild life – killing them off in the process. It produces a phototoxic sap which causes injury upon contact with results including burns, blisters, scarring and leaving disfiguring marks upon a persons, body hands and face as well as effecting animals and pets.

giant hogweed

The Japanese Knotweed

The Killer of Gardens, this plant can grown at an alarming rate and also go undetected, remaining dormant for long periods of time. However, when it grows, it can pass through concrete, building foundations, electrical cabling and piping – causing vast amounts of damage to homes and properties throughout the UK.

japanese knotweed

Himalayan Balsam

A very invasive, non-native plant which is illegal to grow or cause the growth of. Even if you accidentally cause this plant to grow you could face criminal charges. It is illegal to move soil which contains its seeds and accidentally spreading them and its growth. So expert advice should be your first port of call.

himalayan balsam


These plants look harmless enough and are of a purple colour. Due to this, many people overlook them and see them as a nice colourful plant to have around their garden. People also plant them unaware of the dangers – but this family of weed plantation are all poisonous! While actual cases of poisoning are rare, many people are unaware of the silent hazard waiting in their garden.



This weed can grown up to 1.5 meters deep into the ground and can grown out of control quickly. It will re-grow and regenerate very quickly if broken or damaged, making it a nightmare for farmers, gardeners and property owners. This poisonous weed is highly dangerous to grazing farm animals and plantations.


Himalayan Knotweed

This particular member of the Polygonaceae family is often mistaken for Japanese Knotweed, which is why experience, expert analysis and identification is necessary in order to carry out the proper and most effective treatments and control measures. This weed should be controlled in the same way and its characteristics of fast growing and effects on plants and grounds around it are similar.

himalayan knotweed

Hedge Bindweed

An aggressive climbing weed which can grow up to 3 meters in height. It also grows amongst other plants and trees, making it difficult to treat and remove without damaging other plants and garden life around it. Our expert team are on hand to give you advice and help remove this particular weed for you to minimise damage and the spread of weeds.

hedge bindweed

Common Ragwort

This particular weed spreads via the wind, making it a difficult one to deal with as growth and spread can be unpredictable and quick. Ragwort contains toxic alkaloids which are poisonous to various degrees towards grazing animals and pets. Their seeds can remain active for up to 15 years once carried by the wind, giving you some idea of how long an infestation of this particular weed could last, grow and spread if not dealt with professionally and efficiently.

common ragwort

Hairy Bittercress

A common weed to find in gardens across the UK, this weed reproduces and grows continuously by its seed pods firing and covering across a large area when the flowering process takes place. This means it can spread across a large area of your property very quickly without your noticing, so its best to get this dealt with promptly.

hairy bittercress

Deadly Nightshade

As the name suggests this plant is very poisonous , it’s common in central and eastern England but some cases have been discovered throughout the UK in less common areas. So, it’s always worth getting an experts opinion and analysis. A shrubby looking weed with purple bell shaped flowers that grow from it. Poisoning from this particular plant can cause you to experience; dilated pupils, loss of balance and can lead to hallucinations and convulsions.

deadly nightshade

What To Do If You Touch These Weeds

If you come into contact with any of the poisonous weeds, seek medical attention right away! We always advise that you never try and deal with such types of garden weeds on your own. Our team are trained in spotting these weeds and make the process safer for everyone.

CALL US FOR free impartial advice
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