A Polytunnel is not just a structure -it’s a strategic asset. It reduces weather risks, improves output, and enables consistent, high-quality growing regardless of the season. For Irish growers navigating market pressures, labour constraints, and environmental challenges, a Polytunnel offers a return on investment that’s measurable in yields, margins, and resilience.
Ready to take your growing business to the next level?
Get in touch with Jonathan and the team atPolydome.ie to discuss the best setup for your site, your crops, and your growth goals.
Airflow and ventilation are essential for maintaining plant health inside a polytunnel. Without proper air movement, condensation can build up, diseases spread, and plant growth is hindered. That’s why Polydome has introduced a new side window system—offering growers more control over their tunnel environment with a simple, practical solution that delivers immediate results.
Whether you grow for home use or commercial supply, adding side ventilation can improve performance, reduce disease risk, and extend the life of your crops.
Easy Installation with Wiggle Wire System
The cover is fixed to the side window with wiggle wire, and the window mounted with a frame that is fixed with brackets to the Polytunnel frame. This method allows the polythene to be held firmly in place while remaining easy to adjust or replace if needed. The fitting is straightforward, even for growers installing it themselves, and ensures that the tunnel remains structurally sound with no compromise on weather protection.
Adjustable Ventilation for Better Crop Management
Each side window includes three distinct opening positions:
Fully closed for full protection during cold or windy conditions
Partially open to allow passive airflow while maintaining warmth
Fully open to maximise cross-ventilation on warm days
This adjustability gives growers the ability to fine-tune their tunnel’s climate across different seasons and crop types. It’s a key benefit for maintaining consistent temperatures and humidity, particularly in spring and summer when overheating is a risk.
Reduces Condensation and Disease Pressure
One of the most common issues in Irish-grown crops is the build-up of moisture inside Polytunnels. Poor airflow can result in condensation dripping onto plants and encourage diseases such as botrytis, powdery mildew, and damping-off. By installing side windows, you allow air to move naturally through the tunnel, improving plant health and reducing the need for chemical treatments.
Polytunnel windows help to manage the damp, humid conditions that frequently cause problems for growers in coastal and inland areas alike. With this addition, you gain a passive climate control tool that works without needing constant adjustment.
Improved airflow leads to:
Healthier foliage with less leaf spotting or fungal damage
More consistent temperatures, reducing plant stress
Increased productivity, particularly in fruiting crops like tomatoes and peppers
How do I buy a Poltunnel Side Window?
Side windows are available as optional extras on most new Polydome tunnel builds and can be retrofitted to existing structures depending on the model.
For advice on whether side ventilation is suitable for your tunnel, or to place an order, contact the Polydome team.
Our frequent rainfall keeps Ireland green and beautiful. However, since you’ve put up a tunnel and blocked it out, now it is up to you to keep your plants hydrated!
Water, along with oxygen, sunlight and soil, is a basic need of all plants, even though their requirements can vary considerably. From one type of plant to another, from tiny seedling to full-grown, from pots to open soil, and from overcast days to sunny ones this job can keep you on your toes!
How Often?
There is no correct answer to this, but you want to keep your plants somewhere between waterlogged and parched! If the soil feels dry below the top inch or two, it is probably time to water. If plants start to droop or lower leaves begin to yellow they are too dry. When you see moulds and mildews appearing on the soil surface, it is likely too damp. Intuition for this develops quickly enough.
Morning vs. Evening
This is a point of debate. Most everyone agrees that in the heat of the day is not the best time to water. However, if a plant is wilting or is a tiny seedling drying out, it is always better to water than let the plant suffer damage or death. The advantage of evening watering, particularly in very warm weather, is that the moisture can be retained overnight and will evaporate the next day once the heat soars again. The advantage of morning watering is that if you have a hearty nocturnal slug and snail population you can discourage them from slithering along on moist soil munching all of your plants overnight by keeping things at their driest then.
Manual vs. Automatic
This is another point of debate and probably something in between is ideal. Automated systems can be put on a timer and adjusted throughout the season. This is ideal to cut down on time and effort, but it is always wise to monitor the situation and not fully depend on automation. Manually watering allows you to reach every plant and give more or less in specific situations, but it does require a dedication of more of your time. Polydome does supply irrigation equipment, including simple battery-powered automatic timers.
Overhead vs. Underneath
Overhead watering, including overhead irrigation lines and the use of a hose, does have the advantage of washing down leaves like the rain. However, some plants work better with underneath watering, from watering a tray under a pot to using capillary mats or low-level drip lines. Reason for this vary, but this often suits plants that are prone to mildews or blight from remaining damp or leaves that scorch from being watered in the sunlight. In a protected structure where there can be less natural wind and ventilation, this is often an ideal solution. An example of this is using low-level drip lines for tomato plants to avoid blight or feeding potted cyclamen from a capillary mat to keep their leaves healthy.
In the winter, having a roof that keeps excess rain out is a great advantage to many plants. However, the surrounding areas outside the tunnel moisten the areas near the edge, so this is something to bear in mind.
So, the next time it rains, enjoy the raindrops! They are little droplets supporting life!
As the days get shorter and colder, you might think about bringing an electrical power supply to your tunnel or glasshouse. Electricity can power lights, heaters, soil warming cables, propagators and climate controllers, letting you grow a wider range of plants over a longer season. But it’s not just a matter of running an extension cable out from your house; domestic cables and fittings are neither shockproof nor waterproof enough for safety in greenhouses. Electricity and water are a lethal combination. If you only need working lights you could use wireless battery or solar-powered lights with high-efficiency LED bulbs. If you already have a low-voltage garden lighting circuit nearby you could take a short spur off it, provided it can handle the extra load.
If you need mains power, you must get a registered electrical contractor to do the specialised wiring work. At the least, the supply from the house should be through Steel Wire Armoured (SWA) cable buried at least 50-60 centimetres underground with warning tape above it. It should pass through a Residual Current Device (RCD), which monitors the flow of current out from the distribution board and back and trips instantly if they are not the same (i.e. current shorting elsewhere). All sockets, plugs and fittings should be of heavy-duty industrial type with a much higher Index of Protection (IP) rating than domestic ones. They are not cheap, but neither is human life!
Great first day at the National Ploughing Championships, very busy and not a drop of rain. Traffic management seemed to go very well. If you haven’t been come and see us on Row 8 Block 3 Stand 195. A lot of interest in Livestock Tunnels for calves and for sheep as well as Polytunnels for gardening.
Mr Tanguy de Toulgoet, is re running his training session to help people make the most use out of their Polytunnels. It is on the 24th of October and he is in Durrow, County Laois.
As before he will teach on plant production, herb drying, companion planting, winter storage and much more.
The cost is 50 euro per person, it is a half day course and starts at 10am and finishes at 1pm.
People who mention Polydome will get a 20% discount on the cost of the course.
We recovered one of our Verticlair Polyunnels from Filclair, I think this photo is lovely. As well as manufacturing Polytunnels we are agents for Filclair from France who we source Multispan structures from. The Verticlair has straight sides and this particular structure has a fully automatic roll up side ventilation system. A great Polytunnel cannot make a good gardener out of you but it is a tool that a good gardener can do great growing with.
A customer of ours – Mr Tanguy de Toulgoet, is hosting a training session to help people make the most use out of their Polytunnels. It is on the 3rd of October and he is in Durrow, County Laois.
He will cover plant production, herb drying, companion planting, winter storage and much more.
The cost is 50 euro per person, it is a half day course and starts at 10am and finishes at 1pm.
A recent construction we did in Dublin was a 4.5m x 8m Polytunnel. This Polytunnel had ‘side purlins’ fitted which are an optional extra providing extra strength particularly against wind. The customer also ordered a large number of raised beds which we also supply. This Polyunnel also has the optional attractive finish of having the ends of the tunnel without pleating and folding the polythene. This feature is made possible by having an aluminium rail fitted over the end hoop so that a separate cover can be fitted to the gable end (and fixed into the rail over the end hoop as is the polythene on the roof).
We are pleased to configure our Tunnels to suit each customer from a wide range of options.
We have issued a new price list for our Polytunnels. This gives updated prices of Polytunnel kits including delivery to most parts of Ireland. The new Polytunnel price list can be accessed through our website www.polydome.ie.
If you have any queries or questions talk to one of our helpful team Request a call back
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