U.S. mushrooms hinge on Kennett Square

A tiny Pennsylvania borough (Kennett Square) accounts for an outsized share of U.S. mushroom production (~69%, ~451 million lbs in 2024), while China dominates global output (93%). Recent reporting suggests production is shifting to Canada, signaling both local economic dependence and a changing international supply map. — Concentration of a staple agricultural product in one town and near‑monopolistic global production creates tangible supply‑chain vulnerability and trade policy leverage that merit attention from planners and regulators.