High technology greenhouses: Improving tree nurseries efficiency
Summary By incorporating advanced technologies and sustainable practices, a high-tech greenhouse systems for tree nurseries can improve the efficiency and productivity of a nursery, as well as reduce costs and time required to produce high-quality reforestation tree seedlings. In this article, we will explore the various technologies and practices that can be incorporated into a […]
How to Winterize a High Tunnel Greenhouse (Step-by-Step Guide)
Summary To winterize a high tunnel greenhouse like the Tunnel Pro Plus, choose a dry, wind-free day and work with a team of 4–8 people. Loosen but do not remove the straps, detach the poly at the end arches, and set up lifting straps (about one per 50 ft). Attach the poly to a tube, […]
Build a commercial greenhouse
How to build a commercial greenhouse: From choosing the right structure (high tunnel, ground-to-ground, gutter-connected, or glass) to design, permitting, purchasing, installation, and warranty. Helps growers make informed decisions by outlining key considerations like site selection, foundation types, manufacturer selection, and construction options (self-build, supervised, or turnkey). Highlights Harnois Greenhouse’s full-service support, offering engineered structures, […]
2025: New Generation Greenhouse Films Now Available at Harnois
New Greenhouse Covering for 2025 At Harnois Greenhouses, we are proud to introduce the latest high-performance polyethylene greenhouse films from our trusted partner, Plastika Kritis. Their 2025 lineup redefines climate management and light optimization—empowering growers to boost productivity, enhance crop quality, and reduce operational inputs. These new greenhouse films are now available through Harnois and […]
The Ultimate Guide to Buying A Venlo Greenhouse
Commercial Venlo Greenhouses are a game-changer in the world of agriculture. They offer a controlled environment for crop growth, ensuring year-round production. We’ll delve into the factors affecting the cost, how to assess quality, and the importance of size and scalability. We’ll also explore the role of technology and the impact of local zoning laws. […]
Prepare Your Greenhouse for Winter
Optimizing Conditions Winter poses unique challenges to greenhouse cultivation, necessitating the optimization of environmental conditions to ensure plant health and productivity. It’s crucial to maintain an ideal balance of temperature, humidity, and light to mimic the plants’ natural growing conditions as closely as possible. Discover how to grow during the winter with Jean-Martin Fortier. Discover our […]
Engineered Commercial Greenhouse. Why?
An engineered commercial greenhouse structure guarante the quality, durability, and safety of the structure. Engineers have to respect laws and regulations, resulting in an end product that meets the highest standards. Harnois’ team of in-house engineers design durable commercial greenhouse structures and can modify building plans to adapt to your crops and commercial needs. Having our own […]
The Future of Growing Strawberries in a Greenhouse: Elevated Benches
In today’s evolving agricultural landscape, the demand for high-efficiency, sustainable growing systems has never been greater. Producers of small fruits—such as strawberries, raspberries, and blackberries—are seeking innovative methods of growing strawberries in a greenhouse to improve yield, crop quality, and labor efficiency. One transformative solution leading this revolution is the small fruits greenhouse equipped with […]
How much does a commercial greenhouse cost?
Summary Commercial greenhouse cost per square foot varies widely based on scale and sophistication: small commercial greenhouses (under 10,000 ft²) typically cost $6–$10 / ft²; mid-size units (~10,000‑50,000 ft²) range from $15–$20 / ft²; large-scale operations (over 50,000 ft²) may cost $20–$50 / ft² or more depending on advanced system Final costs influenced by materials and added systems: structure type (e.g. high tunnels, freestanding, gutter-connected), coverings (poly […]
How to inspect your polyethylene!
Did you know that it’s important to inspect your polyethylene at the change of season? If your region has experienced high winds, ice, hail, heavy snowfall or any other severe weather event, it’s a good idea to inspect your siding and greenhouse. How to inspect your cladding Installation tip for repair adhesive In the event […]