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Which Is Best Polytunnel Or Greenhouse?

Which Is Best Polytunnel Or Greenhouse

Before you decide to buy a Polytunnel or Greenhouse, consider your needs and your budget. If you’re planning to grow tender plants in the winter, a smaller space is sufficient, while growing summer crops and exotic plants requires a larger space. Some people recommend going as big as the space you have available. It’s important to think about your needs over the entire growing year, not just a few weeks.


Greenhouses and polytunnels both provide the ideal conditions for growing a variety of crops. While greenhouses are more permanent and expensive than polytunnels, they are also more versatile. In addition, they can be used for growing crops that are normally grown outdoors.

Both polytunnels and greenhouses come in a variety of sizes, so you can pick the ideal size for your needs. The biggest difference between glass greenhouses and polytunnels is the price. Although glass greenhouses are more expensive than polytunnels, polycarbonate greenhouses are significantly less expensive. However, the bigger greenhouse, the higher the cost. Some greenhouses can cost thousands of pounds.


When it comes to growing plants, the choice between greenhouses and polytunnels comes down to several different factors. A greenhouse is typically constructed of glass and sits on a foundation, whereas a polytunnel is composed of a plastic frame that can be placed directly on the ground. The difference between the two structures lies in how they allow you to control light and heat. A greenhouse is generally better suited for tropical or exotic plants.

Polytunnels are more versatile than greenhouses, and some of them can even be moved from one location to another. This is especially useful if you are planning on moving or changing your location in the near future.

Cold frames

Using a cold frame is an excellent way to start your seeds. They will quickly become hardy and will grow into plants that are able to cope with the cold weather. It is important to ensure that the frame is properly ventilated so that any excess heat will escape. There are several types of cold frames, so you can build one that best suits your needs.

Cold frames are a great way to protect plants from pests. You can place them over plants you intend to eat, such as salads. In this way, you will reduce the risk of damaging them from slugs.


A polytunnel or greenhouse is a great way to grow plants which don’t grow well in the Great Britain climate. They are ideal for extending the growing season as they can be expanded or contracted as needed. A greenhouse can also be used as a decorative garden accessory, as they are easy to extend and can be used to grow flowers and other plants.

The size of a polytunnel depends on what you need it for, whether you need it for a small garden or a large area. Smaller models are ideal for growing seedlings and other small plants. However, if you plan to grow larger crops, you should consider a large polytunnel. Larger polytunnels offer more space and are ideal for more experienced gardeners. Ultimately, though, it depends on your needs and budget.

Easier to build

When considering building a polytunnel or greenhouse, make sure you consider the size of the structure and the amount of space you’ll need for it. Larger structures can be expensive to purchase and energy-intensive to run. If you’re a full-time salaried employee, you may not have the time to construct and maintain a large structure.

The first step in building a polytunnel or greenhouse is to level the ground. If the ground is uneven, dig out high spots and fill in low spots. You can also use a soft mallet to square the frame. While some people prefer to sink their wooden foundation into the ground, this can cause problems if you want to move it.

Better heat retention

A polytunnel or greenhouse is a great place to grow plants, but there are several things you can do to improve heat retention and keep it from escaping. A good base for a greenhouse is compacted soil, or a paving slab. This will help prevent damp build-up and soil diseases. You should position your polytunnel so that it faces north-south, which will minimise direct sunlight. Moreover, polytunnels are designed with large doors on both ends, which make for better air circulation. Greenhouses also have side vents and a roof opening.

Another way to retain heat is to install a gutter system. This will enable you to collect rainwater on your greenhouse, and lead it directly into a water tank. These systems can also be installed on polytunnels to provide irrigation water. Then, you can plant crops in your polytunnel or greenhouse.

Ventilation options

There are several ways to ventilate your polytunnel or greenhouse. The most popular way is by opening the door, but this isn’t always very effective. If you have one door only, you can’t open it all the way, and this can allow insects and pests to get inside. Alternatively, you can use a mechanical ventilation system.

While there are numerous ventilation options for polytunnels and greenhouses, the basic idea is to let as much natural light as possible through the tunnel. This will help the plants absorb light and heat from the atmosphere. The plastic sheeting on a polytunnel or greenhouse will affect the amount of heat it can retain. If you don’t want to invest in Thermal Anti-Fog covers, you can buy a standard light-diffusing polythene that will allow up to 89% of sunlight to come through.