Tree Seedling Greenhouse Solutions
At Harnois Greenhouses, we understand the unique challenges faced by nurseries and tree seedling producers. From saplings to mature plants, our tailored greenhouses for tree seedlings provide the perfect environment to nurture healthy, robust growth.
Key Benefits
- 60 years of industry experience.
- A true turnkey solution: Form design to completion
- Spearheading Innovation in greenhouses for tree seedlings
- In-house team of Engineers and Agronomists
- Greenhouses for tree seedlings partners:
- Dubois Agrinovation
- Blackmore
- Damatex
greenhouses for tree seedlings
Equipment
- Air Heaters
- Hot Water Radiant Heat
- Guillotine Side Roof Vents
- Roof Vents
- Mechanical Ventilation
Brighter by design
Gothic profile = Optimal light & No dripping
The 45-degree gothic roof angle, combined with high-quality plastic films, optimizes light quality by filtering specific light wavelengths beneficial to plant development. This design also improves internal climate stability, helping growers maintain more consistent growing conditions.
Thanks to the superior strength of Harnois steel structures, fewer structural elements are required in the roof. This reduces shading and allows more natural light to reach the plants, directly contributing to improved photosynthesis and higher yields.
The 45-degree roof angle works in combination with a long-lasting anti-drip film treatment to eliminate condensation dripping. Moisture naturally flows down the roof toward the sides instead of accumulating overhead, preventing water droplets from falling onto the crop and reducing the risk of plant damage and disease.
Why Harnois?
Harnois greenhouses are built using high-quality graded steel and pre-galvanized Galvalume steel tubes (+40 years) for superior corrosion resistance and durability. All our hardware is tested for corrosion and all our suppliers are certified.
Our exclusive oval tube design provides optimized structural resistance while eliminating sharp edges that can damage polyethylene film. Compared to traditional profiles, oval tubing delivers superior strength:
- 28% stronger than round
- 46% stronger than square
- 18% stronger than rectangular
Every Harnois greenhouse is engineer-stamped (except the TunnelProPlus) and designed for simplified installation without compromising strength. Drilling is performed along the neutral axis to preserve structural integrity, with bolted assemblies and swedged tubes limiting on-site drilling. Structural gutters and gothic-shaped arches further enhance load capacity and durability.
Harnois plastic films feature multi-layer technology with advanced anti-drip treatment for maximum light diffusion and thermal performance. With up to 90–91% light transmission, 7.2 mil thickness, and an R-value of 1.9, our films are engineered for longevity and tested in UV chambers to ensure consistent quality over time.
All manufacturing processes comply with ISO 9001:2015 standards, and all fasteners undergo corrosion testing with certified suppliers; ensuring long-term structural reliability.
Recent project: Kingsclear Tree Nursery
Strategic investments in advanced greenhouse technology are enabling a significant production ramp-up, with annual targets reaching 20M–23M native seedlings. This expansion is a critical milestone in supporting high-volume reforestation and restoration initiatives.
Recent project: Red River Métis Tree Nursery
"The greenhouses are sourced from Harnois Greenhouses out of Quebec. Phase one includes a Luminosa seven-bay gutter-connected greenhouse and four individual Ovaltech III greenhouses, which allows for an annual capacity of approximately two million seedlings," said James Best, General Manager, Red River Métis Tree Nursery. "Phase two will add up to 27 additional greenhouse bays."
About our expertise in tree seedlings
The requirements of young tree growers are distinct. Our greenhouses for tree seedlings are specifically designed to support the growth of both local forest species and rare or endangered varieties. With advanced control over temperature, humidity, and light, our solutions create ideal conditions for cultivating strong, healthy seedlings while safeguarding crops from harsh weather and pests.
This tailored approach empowers growers to enhance plant quality and ensure higher survival rates during transplantation, fostering long-term success in nursery operations.
Optimal Environmental Control
A greenhouse allows precise regulation of growth conditions, temperature, humidity, and light, to promote rapid, uniform germination and healthy plant development.
Improved Survival Rates
By providing stable and tailored growth conditions, seedlings cultivated in greenhouses for tree seedlings develop greater resilience, ensuring higher survival rates after transplantation.
Support for Biodiversity
Greenhouse cultivation enables the production of rare or sensitive forest species, which is crucial to reforestation and biodiversity conservation.
Protection Against Weather Extreme
By shielding crops from extreme weather conditions, greenhouses for tree seedlings ensure steady growth and protect young plants from frost, strong winds, and heavy rainfall.
Founding partner of the Canadian Tree Nursery Association (CTNA)
Harnois Greenhouses is proud to be a founding partner of the Canadian Tree Nursery Association (CTNA).
This collaboration reflects our commitment to the sustainable growth of Canadian forests and support for tree nurseries across the country.
The CTNA, established in 2023, represents tree nurseries that produce over 90% of Canada’s tree seedlings. As a partner, Harnois Greenhouses plays a key role in the development and strengthening of this vital sector, contributing to the restoration of green spaces and the health of Canada’s ecosystems.
We are proud to support this initiative and work together to build a sustainable future for Canada’s forests.
Contact your local agent
Start your operation or expand with ease using our greenhouses for tree seedlings. Contact us or request a quote today!