Plant scientists from around the world are coming up with mind-blowing findings, and claiming that plants cannot just sense, but communicate, learn and remember. In an experiment in Australia, plants appeared to learn to associate a sound with a food source, just like the proverbial Pavlovian dogs linked the sound of a bell with dinner. Botanist James Wong explores these findings and asks whether, if plants can do all these things, and if, as one scientist says, they are a "who" and not a "what", then is it wrong to eat them?