During winter, you need to take steps to keep your polytunnel warm. Here are some tips. You can use a thermometer to check the temperature. You should place it near the plants that require the most heat. You can also place heat sinks in the polytunnel.
Crops that do well in a polytunnel
A polytunnel is an ideal place to grow vegetables. There are a wide range of crops you can grow in this structure, including summer vegetables, salad crops, and winter crops. Choosing the right crops for the area can help you to get the best yields. It is also a great way to enjoy fresh air and spend time outdoors. Not to mention, homegrown vegetables are incredibly tasty!
Potatoes are another great crop to grow in a polytunnel. These plants benefit from the protection provided by a polytunnel, and can be protected from a range of pests and weather conditions. Cabbage is another classic winter vegetable, and can be grown in containers for the winter. If you choose to grow it outside in the winter, it will be ready for harvesting by early spring.
Spinach is another leafy green that can grow well in a polytunne. Young leaves can be eaten raw or cooked, while the larger leaves can be added to stews and pies. Spinach prefers cool conditions and will also grow well in a polytunnel during winter. Spring onions, meanwhile, are not normally associated with a greenhouse, but they do well in a polytunnels.
Keeping plants protected from insects
There are a few ways to protect your plants from insects when heating a polytunnell or a greenhouse. You can use fabric row covers, which are basically large domes supported by hoops. Another option is a cloche, which is a solid dome, usually made of clear plastic.
Insects love heat and will multiply rapidly in the greenhouse or polytunnel. These pests can be prevented with proper pest control. You can get these pesticides from local garden centres. It is important to inspect your plants before using a polytunnel, as well as a greenhouse or polytunnel.
A polytunnel can be anywhere from sixteen to thirty feet long. Its size depends on the climate where you live. In colder climates, you can use polytunnels to extend your growing season. They are also cheaper than greenhouses. A smaller greenhouse can be replaced with a polytunnel four to five times bigger. In addition, a polytunnel is portable and can be moved from one spot to another.
Maintaining a positive temperature inside the polytunnel
Maintaining a positive temperature inside a polytunnel in winter is important for the plants inside. It is important to remember that a polytunnel is a microclimate and can function as either a hothouse or a coldhouse. As a result, it is possible to grow both summer and winter crops inside a polytunnel. If you live in a colder area, you should heat the polytunnel to a minimum of 55 degrees Fahrenheit. If you live in a warmer area, you can set the temperature to a maximum of 90 degrees Fahrenheit.
In mid-winter, polytunnels can become frosty and snow can damage the crops inside. This can especially harm cabbages, Brussels sprouts, kale, Asian greens, and hardy winter lettuces. During this time, it is also important to ensure that you have adequate ventilation and heating equipment inside your polytunnel.
During the coldest part of winter, you may find yourself less active in your gardening business. However, using a polytunnel will enable you to continue your crop production well into the spring. By keeping the temperature inside the polytunnel warm, your plants will continue to grow through winter and may even bloom in the spring!
Using a thermal anti-fog cover
The first step to successfully heating a polytunnel in the winter months is to remove the snow. This reduces heat loss by approximately 30%. Next, you should line the polytunnel with bubble wrap. It is important to use UV stabilised bubble wrap for the best results.
Straw mulch can also be used as an effective thermal insulation material. It can be spread evenly inside the polytunnel and will help keep the area warm on cold nights and cool on hot days. However, this method is not recommended for all crops, as it can cause damage to the plants. Straw mulch is widely available and is inexpensive.
Polytunnels are easy to install and are considerably cheaper than greenhouses. They can be built in just a day. But they do have a few disadvantages: condensation and light transmission.