It's the most dangerous plant in the UK say experts and just brushing it with your arm or leg can give you painful blisters ...

Originally from Eurasia, giant hogweed (Heracleum mantegazzianum ... the weed causes a reaction called phytophotodermatitis, leaving burns, blisters, and purplish-black scars in its wake.

Woodland angelica (Angelica sylvestris) is another phototoxic species of invasive weed that, like giant hogweed, cow parsnip, and wild parsnip, produces sap that blisters and burns your skin by ...

The Giant Hogweed Mitigation Project’s founder John Kemp learned about the plant — which can grow up to 18 feet tall and cause long-lasting skin blisters similar to a third-degree sunburn ...