Something strange keeps happening to the huge peppercorn tree on Harry Barclay's farm. For at least a decade, he has seen the evergreen shed most of its leaves around March and April. He believes ...

It has a menthol-like taste, and can cause allergic reactions in people with tree nut sensitivities. And the Sichuan peppercorn? It's the berry of a citrus tree, the prickly ash tree. The berries ...