An Insight into Pit Greenhouses

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Pit Greenhouses 101

Are you interested in gardening and looking for a way to take your hobby to the next level? If so, pit greenhouses may be a solution for you. They are an effective way of providing plants with year-round protection from weather elements, pests, and animals. Compared to traditional above-ground greenhouses, they offer greater stability in temperature and require less energy.

Why You Should Consider Building One Today

Building your own pit greenhouse is a great option if you're eager to start your gardening adventure or just looking for a new challenge. With a simple design and low-cost materials such as concrete and plastic sheeting, it's an affordable project that can provide long-lasting benefits.

Understanding Pit Greenhouses

What are Pit Greenhouses?

Pit greenhouses, also known as underground or subterranean greenhouses, are structures built partially or fully below ground level. They work by harnessing the warmth of the earth, which provides consistent temperatures ideal for growing various plant varieties. They utilize solar energy, natural ventilation, and thermal mass to regulate air temperature and humidity levels.

How Do They Work?

The basic principle behind the operation of a pit greenhouse is the movement of heat from warm to cold areas. The shallow pit dug for the greenhouse absorbs heat from the sun during the day, stores it in the soil, and releases it at night when the outside temperature drops. Air circulation further helps keep the inside temperature steady and regulates humidity levels.

Building a Pit Greenhouse

Building a pit greenhouse is relatively straightforward compared to other greenhouse types. The first step is to select the location, taking into account factors such as sun exposure and drainage. Once the location has been decided, the excavation process begins by digging a shallow pit in the ground. Pillars are then set to support the structure, followed by the construction of walls made from materials such as concrete or wood, and the roof using plastic sheeting. Heating systems and ventilation can also be installed if desired.

Maintaining your Pit Greenhouse

Maintenance of a pit greenhouse involves routine cleaning, checking temperature gauges, and repairing any cracks in the walls or foundation. It's essential to keep the interior dry and avoid excess humidity buildup, which can lead to mold and mildew growth. Ensure proper ventilation, and keep pests under control by encouraging beneficial insects such as ladybugs.

Benefits of Using Pit Greenhouses

Energy Efficiency

As mentioned earlier, one of the primary advantages of pit greenhouses is their energy efficiency. Due to their underground design, these greenhouses require minimal additional heating, making them an eco-friendly option for year-round gardening.

Suitable for Year-Round Gardening

Thanks to the consistent temperature regulation provided by a pit greenhouse, you can enjoy gardening year-round, regardless of seasonal changes. This allows you to grow crops that wouldn't typically thrive in your climate conditions.

Protection from Harsh Elements

Pit greenhouses provide plants with protection from harsh elements such as wind, snow, and hail, which can wreak havoc on crops grown in traditional outdoor gardens. Additionally, they offer shelter against pests and animals.

Types of Plants Suited for Pit Greenhouses

Root Vegetables

Root vegetables such as carrots, radishes, and potatoes are ideal crops to grow in a pit greenhouse. They thrive in the stable temperature conditions provided and require minimal additional heat or light.

Leafy Greens and Herbs

Leafy greens like kale and spinach, along with herbs such as basil and parsley, also do well in pit greenhouses. They require moderate sunlight exposure and consistent watering.

Fruits and Flowers

Some fruit trees and flowers such as orchids can also thrive in pit greenhouses. However, it's essential to ensure adequate drainage and avoid waterlogging.

Pit greenhouses are an excellent option for gardeners looking for a sustainable way to grow crops year-round. The low-cost design, energy efficiency, and versatility offered by these structures make them a great choice for homeowners seeking a new challenge.

FAQ

What is the average lifespan of a Pit Greenhouse?

The lifespan of a pit greenhouse depends on factors such as drainage, soil conditions, and regular maintenance. With proper care and upkeep, they can last for decades.

How deep should my pit greenhouse be?

The depth of the pit greenhouse should be at least 2-3 feet below ground level to take advantage of earth warmth and provide stable temperature regulation.

Do I need special permits to build a pit greenhouse in my backyard?

Requirements for building a pit greenhouse vary by location, and it's essential to check with local authorities before starting. Some places require permits for structures partially or entirely underground.

Can I use a pit greenhouse to cultivate exotic plant species?

Yes, you can use a pit greenhouse to grow a variety of plant species, including exotic ones, as long as the environmental conditions required are met.

Is it difficult to grow plants in a pit greenhouse?

Not necessarily. Plants grown in pit greenhouses require less maintenance than outdoor gardens, and their consistent temperature regulation provides an ideal growing environment.

Can I modify my existing greenhouse to become an underground one?

It's possible to modify an above-ground greenhouse into a partially or fully underground structure. However, it requires significant changes in foundation and support systems, making it a time-consuming and challenging process.

Can you recommend any hardy plant varieties that are perfect for underground cultivation?

Some hardy plant varieties commonly suited for underground cultivation include radishes, carrots, lettuce, and various herbs.

How does heating work for a pit greenhouse?

Heating in a pit greenhouse is usually provided by thermal mass from heating cables or pipes installed in the walls, floors, or pillars. Supplemental heating sources such as propane heaters or electric heaters may also be needed in colder climates.

What is the cost of building a pit greenhouse?

The cost of building a pit greenhouse varies depending on factors such as size, materials used, and additional features like ventilation and heating systems. However, compared to other greenhouse types, they are generally more affordable due to lower energy requirements and simpler designs.

Are pit greenhouses eco-friendly?

Yes, pit greenhouses are considered eco-friendly due to their low energy consumption and reduced use of artificial lighting and heating. They offer an excellent sustainable option for gardening enthusiasts looking to minimize their environmental impact.