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RE: The fascinating phototoxic effect of giant hogweed
Thank you!
You're right! It's not harmless - during the night there is no ultraviolet light coming from the sun that causes the symptoms but they can appear on the next day and also from artificial ultraviolet light.
awful stuff. I once touched a phototoxic plant in a garden, not knowing it was. the back of my hand went red in sunlight for the next couple of weeks.. I'm not sure what the long term effects are. not to be confused with COWSLIP.. a harmless and similar looking (smaller) plant