Joint course leader, Robin Harford, here eating garlic mustard, is a self-taught ethnobotanist and creator of www.eatweeds.co.uk , a website on wild food foraging. He specialises in wild edible plants and has been teaching since 2008. Harford points out that wild plants massively increase the diversity of foods we can eat (from the estimated 20-30 monocultured plants westerners eat in a year, to hundreds once you include wild edible plants). Foraged wild plants are also estimated to be on average two times more nutritious than farmed plants