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What Can You Not Grow In A Polytunnel?

What Can You Not Grow In A Polytunnel

You can find a lot of different vegetables that you can grow in your polytunnel. However, you can also come across some plants that you should not plant in your polytunnel. These include things like Watercress, citrus, and cabbage.


The fiery Japanese condiment, wasabi, has been cultivated for centuries. Originally, it was grown along gravel banks of cold streams. Now it’s commonly grown in the Pacific Northwest, along the Oregon coast. Wasabi has long been used in sushi and salads. It’s been studied for its antimicrobial and stomach calming properties.

Growing wasabi is a challenge. A wasabi grower must have a large, high-tunnel greenhouse and a shade system. This allows the temperature to be controlled to avoid disease and to keep the plants cool.

Wasabia japonica requires moist, well-draining soil and lots of shade. Using a raised planting bed with a well-draining growing medium is also recommended.

The mature wasabi plant will grow two feet tall and two feet wide. Its thick stalk is then ground to make wasabi sauce.


Watercress is a healthy vegetable that can be harvested year-round. It is also easy to grow. You can buy watercress at your local supermarket or farmer’s market.

Watercress is also an ideal crop for indoor hydroponic cultivation. However, you will have to provide ample moisture to the soil. You can also grow the plant in a pond or a slow-moving stream.

Watercress is a highly nutritious leafy vegetable that is popular for salads. Its distinctive peppery taste is similar to radishes. The leaves are best eaten fresh, and are good for cooking. They also make great soups, sauces and more.

Alys Fowler, a former presenter of Gardeners’ World, wrote about the benefits of watercress for Guardian readers. According to her, the most important requisite for watercress is water.


If you are wondering what the big deal is about a polytunnel, the short answer is they are great for protecting citrus trees from cold and frost. You can also put in a humidifier during the drier winter months.

The best way to make lemons grow in a polytunnel is to provide them with the right mix of nutrients and moisture. In general, lemons respond well to a fertilized medium. Lemons, like most fruits, can store a lot of their food in their leaves. They are heavy feeders, so a nutrient rich feed is a must.

The good news is that some citrus trees are hardy enough to thrive in a UK polytunnel. However, they may require special care to keep them healthy. Some trees, including yuzus, are cold hardy and can handle temperatures as low as minus 15 degrees Celsius.


When considering growing citrus in a polytunnel, you will have to decide if you want to plant it in a traditional container, or in a larger, potted structure. If you decide to use a traditional pot, make sure it can hold enough water to keep your citrus happy.

It is also important to remember that some citrus trees cannot handle temperatures below 45oC. So you may need to find a colder spot if you want to grow your citrus indoors.

However, you can grow a variety of vegetables in a polytunnel during the winter months. Spinach is a great example. You can harvest your leaves and add them to salads, stews, and even pie toppings.

You can also plant a radish in a polytunnel. These plants can produce a lot of fruit in a short amount of time, and they are a true cool weather crop.


Originally a cool season biennial, cabbage is a leafy green vegetable. It is a member of the Brassicaceae family. This plant grows best in well-drained, rich organic soil.

There are many varieties of cabbage, and they all have unique qualities. Some are resistant to black rot, while others produce large, crisp heads.

You can grow cabbage throughout the year. Many early varieties are easy to grow for the home gardener. For example, ‘Fargo’ and ‘Primax’ grow quickly, and are a perfect choice for a homestead garden.

Modern varieties have improved disease resistance and flavor. ‘Tendersweet’, for example, is adapted for both spring and summer harvests.

In addition to their delicious taste, cabbages are a staple in any garden. They are hardy and can survive short exposures to frost. To make them last longer, they are ideally stored in a cool place, such as a root cellar.