'Super' giant hogweed on bank of River Darwen in Higher Walton

The weeds, which have been dubbed ‘Britain’s most dangerous plants’, are growing across the River Darwen in Higher Walton.

The plants are growing near the footpath which is used frequently by dog walkers and families with young children, increasing the potential risk for a reaction.

The plants can cause severe burns if they come into contact with skin, and the invasive species are a scourge for gardeners.

A local resident, Mark Woods, 36, who has children himself and walks his dogs regularly down the path said he has seen it getting worse but was very worried last night when he saw young children swimming in the river.

Mark said it looks like trees growing because of how tall it has become

He said: “It is easily the biggest giant hogweed I have ever seen.

"It looks like trees growing and some of the stalks are about 10cm in diameter.

“I have seen it growing and always been concerned but I was really worried yesterday when I saw young children playing in the river because the only way to get down there is to go through all the hogweed.

“People are also going down to the river bank and fishing – I don’t think people realise how dangerous it actually is.”

Mark said it is not just contained to the riverbank but is also taking over the fields on some neighbouring farmland.

Earlier this month, a school issued a warning after a young child had to be treated for second-degree burns in hospital after touching the plant.

The child was left with second degree burns after touching the plant

Hardy Mill Primary School, in Bolton, said: “One of our children has sadly been in contact with this plant over the half-term break and ended up at the hospital with second degree burns.

“Please look out for this plant in your garden and when out and about with your children."

Giant Hogweed is most prominent between June and August and it can be identified by its tall umbellifer and large, white, umbrella-like clusters of flowers.

It has a hollow, rigid stem which is purple-spotted, and it favours damp areas, such as riverbanks.

However, it gained a reputation as one of the UK’s most dangerous plants for its blister-causing sap.

The plant can be very dangerous for children and dogs who do not understand the risks

After contact with the sap, the skin will start to blister and later form a brown scar; the skin will also be sensitive to sunlight for some time afterwards.

Medical professionals advise anyone who comes into contact with it to wash the areas affected with soap and cold water and wear long-sleeved clothing.

Blisters and burns can occur if the skin is then exposed to direct sunlight, and if the plant touches patients' eyes they must report to A&E immediately as it can cause blindness.

If you feel unwell after coming into contact with Giant Hogweed then it is advised to consult with your doctor.

If you discover Giant Hogweed on public land, report it to the council who can take action to remove it.