Sacred Weeds is a four-part television series of 50 minute documentaries investigating the cultural impact of psychoactive plants on a broad array of early civilisations.

Dr Andrew Sherratt, then a Reader in European Prehistory at the University of Oxford, was the series host.

Each episode began and ended with Sherratt inscribing his diary with his reflections on the series' scientific and cultural investigations.

After the four episodes, Sherratt assigned considerably more significance to the psychoactive properties of plants in ancient civilization and the prehistoric period than expert knowledge hitherto.

scientists: volunteers: Ed Taylor, Johnny Green Memorable moments include a long haired participant in baggy clothes, athletically climbing a large tree and yelping with excitement.