Henbane - Hyoscyamus niger - has sticky serrated leaves, yellow, funnel-shaped flowers and a stale scent.The name is of Anglo-Saxon origin (it means killer of hens) and can cause hallucinations, drowsiness and disorientation in humans. Large quantities can cause a loss of consciousness, seizures, trembling of the limbs and, in certain cases, death.
Worall Thompson meant to recommend a wild herb called fat hen. He told BBC that the mix-up was
embarrassing - but one of those genuine mistakes.