Parents are being urged to show children photos of the dangerous giant hogweed plant which can cause severe burns.
Most prevalent at this time of year, it may look harmless, but the plant harbours toxin-bearing sap and causes horrendous blistering burns, even from gentle contact.
The burns can last for several months and the skin remains sensitive to UV light for many years. If near the eyes it can cause blindness.
Community group Bolton NEWT say it's recently been found in Leverhulme Park, along the rivers Tonge and Croal and at Moses Gate Country Park.
Similar to cow parsley, with its long stems bearing large umbrellas of white flowers, it can grow up to five metres in height, and the heads two metres wide. It is noticeable for its coarse haired stems and purple blotchy leaves.
A spokesman for Bolton NEWT said: "We strongly suggest taking a few minutes with your kids to show them these pictures, so that they can safely identify giant hogweed and not panic when you find native hogweed or cow parsley."
Mini First Aid High Peak and Tameside has issued a similar warning about the plant, saying: "Now is the season for 'Britain's most dangerous plant' and with the lovely weather forecast in a couple of weeks time, this stuff will thrive and spread."
In a Facebook post, they said: "All parents, please warn your children not to touch the plant as the leaves, stems, roots, flowers and seeds all contain this terrible poisonous toxin.
"Any parts of the body that come into contact with the sap of a giant hogweed should be immediately washed with soap and cold water and seek medical advice. Further exposure to sunlight should be avoided for at least 48 hours."
