Does anyone know anything about gardening?

Bindweed is also in the same family as ololiuhqui, which was used by
ancient Aztecs as an hallucinogenic drug, and Morning Glory, which is
also reputed to have psychedelic properties. But if you eat lots of
our normal hedge bindweed in the hopes of getting a mind-altering
experience you are more likely to get a trip to the loo than any sort
of psychedelic head trip!

http://www.badwitch.co.uk/2008/07/bindweed-beauty-or-beast.html