Helping growers feed the world
We design high-performance, durable produce greenhouses perfectly tailored to fruit and vegetable cultivation needs. By integrating the latest technologies, we create an optimal climate to promote the growth of your crops.
Our integrated solution supports local and sustainable production, bringing fruits and vegetables closer to their point of consumption. Fewer kilometres travelled mean fresher, healthier produce in your salads and dishes, no matter where you are.
Whether you’re growing tomatoes, peppers, or other market garden crops, Serres Harnois is your partner in building the food agriculture of tomorrow. With us, you gain access to a world of integrated and sustainable solutions designed to meet the demands of evolving markets and consumer needs.
Why Growers Choose a Commercial Produce Greenhouse
Predictable Yields
A greenhouse creates optimal growing conditions by controlling essential factors like temperature, humidity, and light, improving crop yields and ensuring more consistent and higher-quality harvests.
Extended Growing Season
Produce greenhouses allow you to start production earlier and extend it into the fall, providing a greater market presence and the ability to supply fresh vegetables year-round.
Reduced Environmental Footprint
Greenhouses optimize resource use, such as water and nutrients, reducing costs and minimizing the environmental impact of your crops.
Protection Against Weather Extremes
Greenhouses protect crops from adverse weather and sudden climate variations, ensuring more stable production and resilience to climate change.
Crops We Support
Commercial produce greenhouses are designed around the specific demands of each crop. Harnois builds structures optimized for the most common and high-value fruit and vegetable operations:
- Tomatoes: The most widely grown greenhouse crop. Vertical growing systems, gutter-connected structures, and precise climate control maximize yield per square foot.
- Peppers: Long production cycles require consistent temperature management and strong structural support for trellising.
- Cucumbers: Fast-growing and high-yielding, cucumbers thrive in warm, humid environments with excellent ventilation.
- Leafy greens and herbs: High-turnover crops well suited to high tunnel and freestanding structures with lower infrastructure costs.
- Strawberries and soft fruits: Elevated systems and controlled environments extend the season and protect yield quality.
Not seeing your crop? Our team works with growers across a wide range of produce categories
Greenhouse Structures for Produce Growing
The right structure depends on your crop, your scale, and how much environmental control you need. Harnois offers four proven options for commercial produce operations:
TunnelPro Plus - 3 tunnels
Width: 3 x 31 ft 6 in Length: 150 ft
Ovaltech III - 30 x 96
Width: 30 ft Length: 96 ft
From Structure to Turnkey: Choose Your Level of Involvement
Every grower comes to us at a different stage. Some need a structure and nothing else. Others want a fully operational facility, ready to grow from day one.
Harnois supports the full spectrum:
- Structure only: You manage the rest. We deliver a engineered, code-compliant greenhouse built for your site and climate.
- Structure and equipment: We supply and integrate the systems that matter: heating, ventilation, irrigation, benching, and covering.
- Fully turnkey: Design, engineering, installation, and commissioning. One partner, one project, zero gaps.
Whether you’re expanding an existing operation or building from the ground up, we scale our involvement to match yours.
Commercial Produce Greenhouse Projects
Ferme Chapeau Melon is a market-garden producer offering a variety of organic produce. The Harnois greenhouses enable Ferme Chapeau Melon to produce these quality fruits and vegetables using our Ovaltech Model.
Frequently Asked Questions
What crops are best suited for a commercial produce greenhouse?
Tomatoes, peppers, and cucumbers are the most common high-volume crops. Leafy greens, herbs, and strawberries are also strong candidates, particularly for growers prioritizing fast turnover and local market supply.
How long does it take to build a commercial produce greenhouse?
Most projects run 6 to 12 months from design to operation, depending on size, site conditions, permitting, and the level of equipment integration required.
What is the difference between polytunnels and a gutter-connected greenhouse for produce?
Polytunnels are lower-cost, season-extension structures with minimal climate control. Gutter-connected greenhouses are built for year-round, high-volume production with full environmental management. The right choice depends on your crop, volume targets, and budget.
Does Harnois offer full installation and project management?
Yes. We offer everything from structure-only supply to fully turnkey delivery, including design, engineering, installation, and commissioning.
Learn more about our services.
Can your structures handle Canadian winters?
Most Harnois structures are engineered to meet local snow and wind load requirements. The poly covering the field Scale Polytunnels must be removed in areas where it snows more than 3”. We have been building for Canadian climates since 1965.