Connect with us


How Many Degrees Warmer Is A Polytunnel?

How Many Degrees Warmer Is A Polytunnel

In polytunnels, the ideal temperature for most types of plants is 26 to 30 degrees Celsius. However, the temperature can easily rise above this point, especially on sunny days. Too much heat will not only slow germination, but will also lead to disease and pest issues. In extreme cases, overheating may cause the plants to die.

Unheated polytunnel

A polytunnel is a greenhouse that’s heated or unheated. Its purpose is to create a microclimate that plants can thrive in, regardless of the weather outside. A polytunnel is a great option if you’re growing out-of-season plants or want to grow tropical plants. However, be aware that an unheated polytunnel can be as cold as zero degrees.

Plants grow better in a heated polytunnel. You’ll get better light levels and UV protection. You can start growing plants in an unheated polytunnel as early as November. Broad beans, for example, can be planted at this time of year. When planting them, you need to leave about 15 cm between each row.

Heated polytunnel

Heating polytunnels allows them to be considerably warmer than the surrounding temperature. This means that crops will be able to start growing sooner. This is an advantage over open fields, where cold temperatures can cause crop damage. In addition, the polythene used to create a heated polytunnel provides protection from low temperatures. This means that you can start sowing your spring vegetables in the early spring, giving your crops more time to develop and grow.

There are several ways to heat your polytunnel. You can either buy a separate heating unit or use a simple paraffin heater. These are inexpensive and are great for small areas. If you’d like to spend more money, you can use a gas heater. The advantage of this type of heater is that it has a thermostat which controls the heat, ensuring that you can regulate the temperature for the best growth of your plants.

Shaded polytunnel

If you have a polytunnel, you may have noticed that it is warmer when it is shaded. It is an effective way to keep the temperature inside the greenhouse more comfortable during the colder months. This method also helps the plants in your polytunnel to stay healthier and more productive. The shade is also a great way to preserve humidity.

The ideal temperature for most plants in a polytunnel is between 26 and 30 degrees Celsius. On sunny days, temperatures can rise well above this range, which can slow germination, cause diseases, and affect photosynthesis. In extreme cases, overheating can kill plants.


A polytunnel is a small greenhouse that is usually used in temperate regions. Its foil construction protects plants from the external climatic conditions and keeps the soil warm and moist. The warm soil and air inside the greenhouse allows plants to be sown and harvested earlier than they would otherwise. In fact, polytunnels have revolutionized the UK strawberry industry. Soft fruits and vegetables can also be grown in these structures. They are also used for livestock housing.

One of the key factors in controlling the temperature of a polytunnel is air circulation. Proper ventilation allows plants to carry out photosynthesis, which is essential for their survival. If the temperature is high, you can install ventilation fans in your polytunnel to move fresh air. You may also adjust your watering schedule to compensate for hotter temperatures.


If you want to grow crops in cold climates, a polytunnel can help you with this. Its construction allows you to extend your growing season and grow bigger crops. It comes with pre-assembled steel frames and a UV stable polythene cover for protection from harsh weather.

Before you start planting, you should carry out a soil study. This is important to assess the soil conditions and to determine which nutrients are needed to promote plant growth. This soil analysis is an affordable and useful service, and it ensures that your plants receive proper nutrition and water. Incorrect fertilization can lower the yield of your crops.

Greenhouse with polytunnel

A polytunnel is a climate-controlled structure that is attached to a greenhouse, allowing better ventilation. These structures are often made from aluminum, which is easier to install than steel. However, they can’t keep as much heat in the tunnel as a steel greenhouse does, and their frames can bend and break more easily in harsh weather conditions. Wooden polytunnels are a good alternative, as they last longer when properly assembled. However, they do require special protection from oxidisation and damage from extreme weather.

The ideal temperature for most plants in a polytunnel is 26-30 degrees Celsius. However, the temperature can rise above this range on sunny days, and overheating can lead to slow germination and increased pest and disease problems. In the end, overheating can even kill plants.