Huge toxic plants which can burn the skin have increasingly been found across the UK as temperatures soar.
Hogweed, which can tower 23ft tall, can cause horrific third-degree burns, ulcers and even blindness are growing in the sweltering 24C temperatures many parts of the country are enjoying.
In fact, a map published by PlantTrackers shows the plant's existence in the UK is on the rise - especially across Gloucestershire, Herefordshire, Somerset and other rural counties.
A River Trust expert said: "It is, without a shadow of a doubt, the most dangerous plant in Britain."
Parents, in particular, have been advised to warn children not to touch the plant whose leaves, stems, roots, flowers and seeds all contain the poisonous toxin.
There have been several cases in the past of youngsters screaming in pain from the agonising blisters which appear on their skin.
Dean Simmons was left with life-changing injuries after brushing against one of the plants growing in Taunton, Somerset, back in 2015.
Speaking at the time, the horticulturist said: "I feel so stupid - because of my job, I had knowledge of this plant and was still caught out.
"I was out fishing and didn't see it until it was too late - and a day later I was on morphine."
Hogweed's tentacle-like fronds touched his bare legs and he suffered agonising skin burns that doctors say would take months to heal.
The plant, which kills off rival native plants by growing so fast and big that it blots out their sunlight, loves to lurk along rivers and canals to 'ambush' families out for a walk.
The sap contains toxic chemicals known as photosensitising furanocoumarins, which react with light when in contact with human skin, causing blistering within 48 hours.
Effectively the toxic sap prevents the skin from protecting itself from sunlight, which can lead to very bad sunburn and scarring.
If accidentally rubbed in the eyes, the sap can cause temporary or even permanent blindness.
Anyone who comes in contact with the weed is advised to cover up the affected area, to prevent the sap reacting with sunlight, and to wash it with soap and water.
