An Aid in Cultivation
Garden and commercial polytunnels have aided in how we can now produce fruits, vegetables, plants, and flowers. In very large and small garden polytunnels, these effective structures are not just about extending the growing season; they also provide a significantly protective and flourishing environment, enhancing productivity and sustainability, providing a controlled environment that can yield substantial amounts of fresh produce inside commercial polytunnels
Commercial and Garden Polytunnels in Agricultural
or Horticultural Settings
For commercial growers and farmers,
commercial polytunnels are game-changers. They enable the space for vast
amounts of fresh produce, particularly in climates less than ideal for
year-round growing conditions. In the UK for example, around 80% of soft fruits
sold in retail are grown in these versatile housings.
How Polytunnels Work
Most professional commercial and garden polytunnels
are constructed using a framework of steel tubes covered with a transparent
grade of polythene sheet. Available in effective design shapes, that trap heat
and raise the temperature inside the tunnel, creating a micro-climate, greenhouse
effect. The soil warms up quicker when under these shelters than it would, in
an open environment, encouraging faster plant growth. Additionally, the
polythene cover diffuses sunlight, reducing the risk of sunburn on delicate
plants while providing ample light and heat for photosynthesis and warmth.
To optimise conditions inside commercial or
garden polytunnels additional measures can be added, such as ventilation and
shading are often employed. This helps maintain a balanced temperature, that prevents
burning and overheating, which can be detrimental to certain crops, carefully
controlling these factors means gardeners and farmers can look at cultivating a
wider range of plants that may otherwise struggle in the open-air locations
around the UK.
For those growers interested in growing
fruits, polytunnels are perfect for tomatoes, strawberries, raspberries, and
other soft fruits. Fruits often require protection from cold blustery weather
and high wind or lashing rain, which can damage crops and reduce yield. The
controlled environment of a polytunnel not only shields them from the elements
but also provides the warmth they need to ripen fully.
Both garden and commercial polytunnels are a
boon for flower and plant enthusiasts. Many flowers grown from seed require
specific temperatures and humid conditions and can be successfully grown under
a protective covering, extending their blooming period and enhancing healthy
growth in colour and fragrance.
What Not to Grow
While polytunnels are incredibly versatile, some
plants are not suited to this environment and prefer to be out in the open. Many
plants that prefer cooler conditions or require a lot of air circulation might
struggle in warmer, more humid conditions of small garden polytunnels. Root crops
like garlic and onions, which prefer dry conditions, may also not do as well,
so always check what types of veg and plants like being grown in outdoor
conditions
Additionally, it's essential to consider the
space and finishing size of the plants you wish to grow. Fruit trees, plants
and crops that grow taller than the known height of the polytunnel should be
planted out when sturdy or avoided, as they could damage the covering.
Similarly, any plants with thorns or sharp edges may cause a puncture or tear
in the polythene cover, leading to costly repairs.
In both garden and commercial polytunnels,
crop rotation is crucial. This practice involves changing the types of crops
grown in each section of the tunnel and each season to prevent soil nutrient
depletion and to help reduce the risk of disease. By rotating crops, you ensure
that your soil remains healthy and fertile.
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