Greenhouse Maintenance Best Practices for Year-Round Performance
A well-designed greenhouse requires far less maintenance than many people expect, but it does require awareness. Regular, thoughtful care ensures consistent performance, protects materials, and extends the life of the structure. Seasonal check-ins and occasional adjustments help the greenhouse continue functioning as a balanced system.
This guide outlines practical maintenance best practices for a Growing Dome greenhouse, but the basics can be applied to most greenhouse styles. These tasks can be performed by the owner, a local contractor/handyman, or a professional maintenance crew.
Just like changing the filters in your furnace or the oil in your car, regular maintenance of the systems within your greenhouse will increase longevity and reliability.
Annual Greenhouse Maintenance Tasks
At least once a year, ideally in spring and/or fall, take time to perform a general check of systems and moving parts.
If your greenhouse includes a water feature with a pump, clean the internal filter of the pump and the filters inside the spillway to prevent buildup and ensure proper water flow. It is advisable to do this once a month or more frequently, depending on the clarity of the pond.
Check all automatic vent openers and oil the threads as needed. Verify that vents open and close smoothly and respond correctly to temperature changes. Also, inspect the restraining cords and weather stripping, and replace them if brittle.
If you live in a cold climate, winterizing steps, such as removing pistons from automatic vents and shutters, help prevent damage during winter conditions.
Greenhouse Maintenance Every 2–3 Years
Every few years, a more detailed inspection helps prevent slow wear from becoming a larger issue.
Inspect the clear aircraft tape, check tape overlap points for lifting or leaks. If you see dirt under the tape, that is an indicator that the area could use some attention. Inspect vent hinges and reapply tape where needed. These areas tend to need more attention due to the repeated opening and closing motion of the vent itself. Small repairs, such as applying a square of tape over a compromised area, are usually sufficient.
Check siding and screws, replacing any that have loosened or corroded. Wood siding may benefit from a fresh coat of exterior paint to maintain appearance and durability.
Finally, check the structural nuts and bolts throughout the greenhouse and tighten as necessary.
Five-Year Greenhouse Maintenance Review
Every five years, repeat the 2–3 year greenhouse maintenance tasks and conduct a full inspection of all tape, weather stripping around doors and vents, and fasteners. Replace or reinforce materials where needed to maintain integrity. This periodic reset helps ensure the greenhouse continues to perform as designed.
Caring for Key Greenhouse Systems
The Above-Ground Pond
The above-ground pond should remain filled to within two to three inches of the underside of the crossbar in oval ponds or 4-6” below the top edge of the pond wall in round ponds. Water cleanliness can be maintained naturally using water features, filter pumps, aquatic plants, and beneficial organisms such as water snails.
Many growers choose to keep fish in the pond, which can further support balance and clarity. If older pond components have degraded, upgraded materials are available.
Undersoil System
The undersoil system is largely self-sufficient. It plays an important role in air circulation. Occasionally, switches may corrode and require replacement.
Important note: never spray water directly on the undersoil fan, as moisture can cause failure. Replacement fans are available if needed.
Vents and Ventilation
Vents deserve special attention before summer and winter growing seasons. Inspect restraining cords that prevent wind damage and ensure all screws remain tight. Oil vent openers regularly, especially threaded components, and confirm proper operation before extreme weather sets in.
Fans require minimal maintenance since they operate via a thermostat. Ensure proper function in spring before the summer heat sets in, and adjust the fans in the winter according to your growing needs and outside temperatures.
Structural Components
Over time, natural wood shrinkage can cause nuts and bolts to loosen slightly. Checking and tightening these every few years helps maintain structural integrity. Also, wooden struts will naturally darken over time, but if there is an area of particular concern, you can use a flathead screwdriver to test the integrity of the wood.
Growing Domes manufactured after 2010 use struts treated with an earth-friendly LifeTime treatment and require no additional sealing. Older domes benefit from reapplying a non-toxic sealant, such as linseed oil, approximately every five years.
Polycarbonate Panels and Tape
Polycarbonate panels require minimal maintenance. To maintain clarity and light transmission, it is advisable to clean the panels at least once a year. Simply wipe the surface with a diluted vinegar and water solution (50/50 or less vinegar). It is best to do so in indirect light and wipe clean with water and a dry rag to avoid water spots. The vinegar will help to kill any potential fungal disease spores that may be present from plants pressing up against the polycarbonate. If replacement panels are needed, we can provide single panels or full replacement kits. Simply contact our office for a quote.
Clear aircraft tape should be inspected periodically, especially around screws. If tape lifts or dirt accumulates beneath it, small repairs can prevent leaks and material degradation. Repair typically involves removing compromised tape, retightening the screw, cleaning the area with alcohol, and applying a new tape patch with firm pressure. We can provide you with more in-depth instructions upon request.
Maintenance as a Long-Term Relationship
A greenhouse that performs well year-round does so because it is observed, understood, and cared for, not because it never needs attention. These greenhouse maintenance best practices support consistency, reliability, and longevity. Over time, they become part of the rhythm of growing, reinforcing the greenhouse as a stable, trusted environment.
