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What Are the Disadvantages of Polytunnels?

What Are The Disadvantages Of Polytunnels

Having a Polytunnel can be a big plus for your garden, however, there are some disadvantages that you will need to consider. These disadvantages can include the cost, the lack of ventilation, and the extreme weather conditions of your area.


Whether you’re growing vegetables, herbs or livestock, polytunnels are a smart way to grow and store crops. They protect plants from bad weather and pests and provide a safe environment for growth.

Polytunnels are often used in plant nurseries, as well as in commercial and household gardens. For home use, polytunnels can be ordered online, delivered straight to your doorstep. They come in different sizes, and can be ordered with different accessories. They come in a variety of colours, and are suited to growing different crops.

A commercial polytunnel starts at around 36 feet long. They are generally made from super-therm 800-gauge polythene, with hinged doors on each end.

They’re great for extending the growing season, but they’re also useful for controlling the humidity and temperature. They are best suited for growing crops like peppers and zucchini. They also work well for growing certain kinds of mushrooms.


During a drought, it can be difficult to know how to protect your polytunnel. But you can do a few things to make it a little more resilient.

The first thing you should do is to collect rainwater. You can store it for use in dry weather. You might need to purify it, though. A gutter system is a great way to collect rainwater in your polytunnel.

Another good idea is to improve your soil. This will help your polytunnel withstand the test of time. It’s also a good idea to mulch with organic matter to increase the soil’s resilience.

One good way to protect your polytunnel is to erect a windbreak. Planting windbreak shrubs or trees will help protect the structure from strong winds. This can help protect your crop as well.


Choosing between polytunnels and greenhouses can be confusing for many plant growers. They want to know which will work best for their crops.

Greenhouses are climate-controlled structures that protect plants from extreme weather conditions. They use a heated system to control the airflow and temperature. The structures are usually made of glass or plastic. Some are attached to the property and other are free-standing. They are a good choice for growing exotic plants and flowers.

Greenhouses can be more expensive than polytunnels. They are also more durable and can last for years. They are also more attractive than polytunnels.

Polytunnels are cheaper per cubic metre than greenhouses. You can use them for growing vegetables and fruits until they are ready to harvest. Polytunnels are also great for growing exotic plants and flowers.

Excess humidity

Using polytunnels to grow your crops is an excellent way to protect them from extreme heat and cold. However, excess humidity is not a good thing. The proper ventilation of the polytunnel is essential to keep the humidity levels within the correct range.

Polytunnels can be made of wood or aluminum. These materials are long lasting when they are treated properly. However, they are not as strong as steel and may break or corrode.

Typically, plastic covers the polytunnel walls. While plastic is affordable, it can also degrade over time. Plastic coverings need to be replaced about every four to five years.

Depending on the size of the polytunnel, it can cost from around fifty dollars to more than four hundred dollars. There are also smaller tunnels for less than a hundred dollars.

Proper ventilation

Having proper polytunnel ventilation is important to maintaining healthy plant growth. In addition to keeping humidity under control, proper ventilation can help control temperatures in the greenhouse.

Most polytunnels are made from double layers of polythene reinforced with nylon mesh. This makes them more insulated and more resistant to abrasion and weather damage. The type of polythene used in the polytunnel can affect its temperature. Thermal polythene is warmer than normal polythene, whereas light-diffusing polythene is cooler than thermal polythene.

The ideal temperature for most polytunnel plants is between 26 and 30 degrees Celsius. When temperatures soar, ventilation fans can be used to help keep plants cool.

The temperature inside a polytunnel is largely a function of the humidity in the air and the amount of carbon dioxide absorbed by the plants. On sunny days, temperatures can soar beyond the ideal temperature.