The Holland Marsh: Challenges and Opportunities in the Greenbelt

Ontario’s Holland Marsh is one of the Greenbelt’s most important specialty crop areas, combining highly productive farmland with a long history of drainage engineering, vegetable production, and regional food distribution. Used for commercial vegetable growing since the canal system was completed in 1930, the Marsh spans more than 7,000 acres of fertile organic black soil that supports crops that would not thrive in many other soils.

The Holland Marsh is often called the ‘Salad Bowl of Ontario,’ growing a variety of vegetables including carrots, onions, snow peas and cabbage.

The Marsh is a crucial part of Ontario’s agricultural economy. Some 100 farms are located in the area, and carrots and onions are the two most common crops, accounting for roughly 70 to 80 percent of the Marsh’s farmland. At the same time, the canal system requires maintenance, and soil erosion and phosphorous runoff remain significant concerns.

Key Findings

• The Holland Marsh is a designated Specialty Crop Area in Ontario’s Greenbelt and includes more than 7,000 acres of fertile organic black soil.
• Around 100 farms operate in the Marsh, down from roughly 300 to 350 in the late 1970s as smaller farms were consolidated into larger operations
• Carrots and onions dominate production, accounting for about 70 to 80 percent of farmland; the Marsh grew 59 percent of Ontario’s carrots and 55 percent of its onions by area in the 2001 census.
• The Holland Marsh has a total economic impact of around $1 billion annually, including farm gate value, packaging, and transportation, making the Marsh a key element in the agricultural economies of the both province and the entire country.
• The drainage system is essential to farming in the Marsh, yet the report says the canals had not been dredged since 1955.
• Soil erosion, phosphorus runoff, and climate-related changes in irrigation are among the most significant long-term challenges identified in the report.

The Holland Marsh remains one of the Greenbelt’s most productive agricultural landscapes, but its future depends on maintaining the infrastructure, soil, and water systems that sustain it. Continued attention to drainage, stewardship, and watershed health will be important to sustaining this productive agricultural community, both economically and environmentally.