Northway Mushrooms have created 20 new jobs at the Ballygawley site following a £25m spend.
Northway Mushrooms chief executive, Elaine Shaw:
"The facility is truly a game-changer for our local mushroom industry and gives Northway members more control over their supply chain, cushioning us against Brexit headwinds while providing us with the opportunity to fill the demand for quality UK/Irish produce," she said.
"The support from our members, the wider agri and food manufacturing industry, and our funding partner, First Trust Bank, on this project has been fantastic," she said.
"It takes knowledge sharing across sectors to innovate and through this facility, we've managed to shorten the supply chain and give our growers a solid foundation from which to grow further."