You can't make pesto alla Genovese without basil or a Mojito without mint. You can use peppermint to settle an upset stomach, ease arthritis pain with stinging nettles, and heal burns and wounds with aloe vera. And then there is cannabis, perhaps the most notorious herb of all. Despite the fact that herbs are often little more than weeds, cultures around the globe have found hundreds of uses for them, employing them in everything from ancient medicines to savoury dishes. While much has been written on cooking and healing with herbs, little has been told about the history of the plants themselves and the incredible journeys they have made.