Yes, that is what the Gnostic lecture reckoned too. I found this on the mandrake
http://www.wisdomplants.net/doku.php?id=mandrake
Mandrake has quite correctly been described as “the most famous magical plant in history”. Its medicinal and magical uses, its aphrodisiac and psychoactive effects, and its mythology and the legends surrounding the plant all raise it above the level of any other magical plant. There is probably no other plant about which such a rich and varied literature has been produced.
Probably the oldest written mention of the mandrake occurs in the cuneiform tablets of the Assyrians and the Old Testament; these refer primarily to the area of Babylon. In Assyrian, the mandrake was known as nam-tar-gir(a). Nam Tar was the god of plagues; ira means “male”. An Ugaritic cuneiform text from Ras Shamra (15-14th B.C.E.) appears to refer to a ritual; the text reads, “Plant mandragoras in the ground …”.
In ancient times, mandrake was an enormously important ritual, inebriating, and medicinal plant. The German name alraune suggests an Old Germanic use of the plant: “Alraun comes from Alrun, and originally meant “ho who knows the tunes” or “the all knowing”. The Germanic seeresses, who by late ancient times were known far beyond Europe’s borders for their miraculous abilities, would enter a prophetic ecstasy with the aid of such magical agents and shamanic techniques. With the Christianization of Germania, mandragora (as an ancient pagan ritual plant) was demonized.
Although Mandragora is numbered among the witches plants (witches ointments), it was often counterfeit during the Middle Ages because it was also valued as a talisman and bringer of luck. Surrogates were sold in pharmacies even as late as the 20th century. Because of the difficulty in obtaining actual plant material, mandrake has never attained much significance as a psychoactive plant in the hippie subculture or among the modern closet shamans. Surprisingly, the psychoactivity of the root has never been the object of any systematic study.
Traditional and Ritual use:
Traditionally consumed for its powerful aphrodisiac effects and love magic properties. Also used for its inebriating, hypnotic, euphoric and visionary effects.
In ancient times, the primary ritual significance of the mandrake was in erotic cults. Because of the poor quality of the sources that have come down to us, however, only rudimentary information about these practices is available. The most important source about the use of mandrake in the Orient is the Old Testament, where the fruits (love apples) are mentioned numerous times under the Old Hebrew name dûdû’îm and namely as an aphrodisiac. It is possible that the mandrake, which according to kabalistic principles is a symbol for becoming one, may have been used in secret mystical rites in ancient Israel.
The aphrodisiac quality was attributed primarily to the scent of the ripe, golden yellow fruits. In the Near East today,. The aromatic fruits of the mandrake are still regarded as aphrodisiacs and used in love magic.
The most extensive description of this magical and erotic root and the ritual surrounding its harvest is from Flavius Josephus (1st century), who wrote in Greek so that he could make the customs of the people of Judea more comprehensible to the Greeks. It is possible that he obtained his magical and botanical knowledge from the Essenes, with whom he lived for some time.
In ancient Egypt, mandrake fruits were used as gifts of love during courtship and probably were eaten as aphrodisiacs. The love plant appears to have been associated with Hathor, the goddess of love. The mandrake beer that was consecrated to her played an important role in the famous myth describing the destruction of the human race and the creation of heaven. end of quote
So we thought they were just having a drunken party, but they were having visions as well.