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What Can You Not Grow In A Polytunnel?

What Can You Not Grow In A Polytunnel

Polytunnel crops are not immune to pests. Mice are the most common problem, eating any overwintering plants. To prevent these pests, you can sprinkle cayenne pepper on the plants, or keep the doors open as much as possible during the summer. There are also ways to get natural predation on your crops.


Rhubarb is a hardy annual plant that thrives in hot climates. If you live in such an area, you can start rhubarb from seeds. Make sure to soak the seeds overnight to soften their outer covering and make the germination process easier. Then, fill a 4-inch pot with potting soil and water well. Once the seedlings appear, keep them indoors at room temperature. Once they have grown a little, move them to a bright window.

While rhubarb can be grown from seed, it is typically planted as dormant crowns during autumn and spring. When you purchase these crowns, make sure to buy the best varieties for forcing. This way, you can grow rhubarb year after year.

Rhubarb is a perennial plant and will grow for 15 years if given the right care. Its roots are chunky, so you will need to provide a rich compost or pelleted manure to help it grow. It will grow better in a polytunnel because it creates a micro-climate that will support the plant’s growth.

Rhubarb grows best in soil that is cooler and well-drained. It also prefers a shady spot in the afternoon. Temperatures below 40 degrees are ideal for growing rhubarb. The yield is about 10-18 tons per acre.


Although artichokes are a vegetable that can thrive outside, they need a protective growing environment. A polytunnel can protect these tender plants from frosts and pests. They also require a fertile soil and regular watering and feeding. However, you can grow artichokes in beds without a polytunnel.

When you grow artichokes, you should make sure they get plenty of sunlight and light. If they get too much shade, they may drop their leaves. They can also become wilted or even die. If this happens, you should treat the problem quickly.

When planting artichokes, make sure you start the seeds about 10 weeks before the last spring frost. Artichokes need some time to get used to the temperature. You should plant them about four feet apart and make sure they are adequately fertilised. Once they reach maturity, they will grow to be about four feet tall and wide. They like shade in the afternoon and will not do well in a hot greenhouse or polytunnel.

You can also grow artichokes in containers. They can be grown in pots or large pots. You can also grow them in soil that has rich organic content.


When preparing soil for onion seeds, make sure it is free of large debris. It should also have good drainage. The soil should be loose and crumbly, and free of any large stones or other debris. Ideally, the soil should be moist but not so wet that the roots of the plant become wet. If you’re planting in clay soil, loosen it by raking it with a hard rake.

Onions can be grown in a variety of ways. For example, there are long-day, short-day, and bulbing onions. Long-day onions require at least fourteen hours of sunlight daily. They grow well in New Hampshire gardens because they have plenty of time to develop multiple leaves and form bulbs.

Onions prefer full sun, but some varieties will grow in partial shade. If you’re growing them in a shady spot, choose a variety with a short day. Generally, onions need a soil pH between 6.5 and 7.0. If you have a clay soil, add organic matter to improve the drainage.

Onions are best grown as seedlings. This method gives better yield than sowing seeds directly into the ground. They also mature two to four weeks earlier than they would in an open field. The process begins with planting the seeds in a pot in early March. Then, the seedlings are moved to the next phase, depending on their growth. Depending on their size, onions can be harvested as early as 20 days after planting.