South Mill Champs expands mushroom processing capabilities with acquisition of The Mushroom Company South Mill Champs, one of the largest high-quality mushroom growers in North America, has acquired The Mushroom Company based in Cambridge, MD. The Mushroom Company is one of North America's largest mushroom processors. Over the last 90 years it has built a reputation for high-quality, innovative products and superior dedicated customer service. The Mushroom Company's product capabilities range from individually quick-frozen (IQF) to canning, blanching, blending, and roasting mushrooms and other vegetables. It primarily serves the food service and industrial markets, where its mushrooms end up on pizzas, in soups, and on various quick and casual-service restaurant menus.