Agriculture and agribusiness are the forefront of Leamington’s economy, with the rapidly growing greenhouse industry represents $1 billion in farm gate value. Over 60% of Ontario's greenhouses can be found in the Leamington area. In fact, the area's greenhouse acreage is larger than the entire U.S. greenhouse industry combined, making it home to the largest concentration of greenhouses in North America with nearly 2000 acres “under cover”. The broader agribusiness sector is a $3 billion industry with almost 8,000 employees spread across more than 100 food and beverage processing companies and over 1,500 growers. Principal crops include tomatoes, seedless cucumbers and peppers, and cannabis.
A supportive business environment has influenced the establishment of numerous industries related to Leamington’s fast growing and profitable agri-business and greenhouse sector. Major employers include Highbury Canco, Aphria, FortDearborn, Highline Mushrooms, Elring-Klinger, South Essex Fabricating, MGS Horticultural, Nature Fresh Farms, Hub International, Lakeside Produce, AMCO Farms and many more large agricultural producers.