Angels' Trumpet flower

The 18-year-old, only named as Andreas W, from Halle in Germany drank a tea made with the hallucinogenic angels' trumpet plants.

His mother said: "Andreas was behaving normally the whole day until he left the house and disappeared into the garden for a couple of minutes."

When he returned to the house he was wearing a towel wrapped around him and was bleeding heavily from his mouth and between his legs.

The emergency doctor who arrived a few minutes later said the student had cut off his penis and his tongue with garden shears and it was impossible to reattach the organs.

Dr Andreas Marneros, from the local psychiatric hospital the student was admitted to, said: "Andreas will have to receive psychological help for years. Tea from Angels' Trumpets is extremely dangerous as the drug cannot be dosed."

Angels' Trumpets, known for their fragrant and trumpet shaped flowers, have increasingly become popular as an alternative drug in Germany.