It seems that bees are affected by caffeine and this may be used by plants to help them pollinate. Geraldine Wright and colleagues at the University of Newcastle, UK have shown that bees are more likely to remember the presence of sugary water presented to them if the water is laced with caffeine. In nature, over 100 plants produce nectar containing small amounts of caffeine (and nicotine too). Originally this was thought to be present to deter predators, but it may well be that an equally (or more) important reason is to attract bees.
Rose Canada member project in Zambia, Malambo http://malambograssroots.ca is being supported in a honey production project by Bee World B.C http://http://www.honeybeecentre.com/bee-world-project international projects