The garden has an additional section for plants that are ‘toxic’ in a different way. Duchess Percy has included a section in which she grows a variety of plants typically sought for drug use, from cannabis to cocaine. She and the guides use this portion of the park as a lead-in for drug education. “It’s a way of educating the children, without them knowing they’re being educated” she says. A natural narrative on death and drugs: not exactly two topics that might be of immediate interest to children, but ones that you will surely encounter near Alnwick Castle.