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How Do Polytunnels Protect From Frost?

Do Polytunnels Protect From Frost

Polytunnels are a versatile cover for your crops. These structures come in a variety of sizes and are supported by hoops. They offer a range of benefits, including temperature regulation and thermal mass. They also protect against insects and a variety of pests. This article will look at a few of these benefits.

Temperature regulation

Temperature regulation in polytunnels is important to keep plants healthy. When the temperature is too high or too low, the plants can suffer and die. In polytunnels, the temperature is controlled by foil that covers the steel frame. This helps to prevent the soil from becoming too warm or too cold, thus allowing for early sowing and growth of crops.

The temperature inside a polytunnel quickly rises during the day, particularly if the sun is shining. This is because infrared radiation cannot pass through glass or polythene, so the heat builds up inside. In these circumstances, you can lower the temperature and increase humidity by increasing the amount of shade in the polytunnel or by adding additional cover.

Thermal mass

When designing your polytunnel, you should consider how to use thermal mass to protect your crops from frost. You can use materials such as straw, bracken, and sheep’s wool as mulch. Another option is to use hot beds. These are raised beds filled with heat-generating materials. They will help keep your plants happy even when it is snowing outside. This method is even more effective when used with polytunnels.

If you don’t want to invest in a large polytunnel, you can opt for smaller mini polytunnels. They are convenient for small gardens and cost less than regular polytunnels. However, mini polytunnels still have the same benefits as regular polytunnels.

Plant protection

Polytunnels are a great way to protect plants from frosts. Frosts can cause considerable damage to plants, especially during the mid-winter months. Many crops, such as cabbage, kale, Brussels sprouts, and Asian greens, are susceptible to damage from frost. Some are more resistant to the cold, but they can still be damaged if they’re not protected from the cold.

The structure of a polytunnel consists of a plastic layer with air bubbles that trap heat inside and limit the loss of warm air. The larger the bubbles, the more light that can penetrate them and improve the heating process. It’s recommended that you remove snow from the tunnel to reduce heat loss.

Insect protection

When a polytunnel is not used for growing plants in the winter, the snow that falls on top can cause damage to the structure. The snow can also block light to plants. Luckily, there are several ways to deal with this problem. One option is to use a traditional polytunnel heater.

You can also buy a fabric row cover, which is a dome-shaped structure supported by hoops. Another option is a cloche, a solid plastic dome.

Length of cover

When it comes to polytunnels, it’s important to select the right one based on the needs of your garden. The right one should protect your plants from the cold winter months but at the same time lock in moisture. Seeds need water to germinate and grow strong roots, so choosing the right cover will help keep your plants healthy.

One of the best ways to protect your plants from frost is to mulch them. A thick layer of wool or bracken can help your plants keep their roots frost free. Another method is to build a hot bed, a raised bed filled with heat-generating materials. This will keep your plants happy even in the snow and can be even more effective in polytunnels.


If you are looking for the best way to grow fruits and vegetables, you can buy polytunnels. These structures allow you to grow plants year-round in a climate-controlled environment. This method is also known as vertical farming. Growing crops in these structures is possible even in colder regions. This makes it possible for small-scale farmers to grow food on a large scale. In addition, they are ideal for extending the growing season. They can even be used for commercial farming.

If you are concerned about the cost of a polytunnel, you should look at the materials that it is made of. While wooden structures are durable and strong, plastic frames are more affordable and have excellent insulating properties. However, the downside is that they break easily and have to be replaced. For a more economical option, you can choose green polythene, which is a type of plastic that allows 65 percent of light to enter the tunnel. This type of material has several benefits, including being environmentally friendly and looking like the forest floor.

Size of tunnel

When you are planning to build a polytunnel to protect crops from frost, you should consider the size of the structure. A bigger structure will offer more space for planting and storage. However, bigger structures need stronger support and a foundation. To make sure your polytunnel is secure and stable, you should consider using concrete for its door frames and foundation.

A small polytunnel can be a great choice for smaller gardeners. However, it may not be as easy to assemble as a larger one. It may require some time and effort to get the structure set up, and you may want to consider purchasing a polytunnel with pre-attached poles.