Plastic Greenhouses

A Comprehensive Guide to Plastic Greenhouses

Plastic greenhouses are a popular choice among gardeners across the UK, primarily due to their affordable pricing, lightweight structure, and the flexibility they offer for various gardening needs. In this guide, we will explore the features, materials, and unique use cases of plastic greenhouses, helping you to make an informed decision while choosing the ideal greenhouse for your needs.

What is a Plastic Greenhouse?

A plastic greenhouse is an outdoor gardening structure created to provide a controlled environment for growing plants. This category generally includes various types of greenhouses whose frames and coverings are predominantly made of plastic materials, such as PVC or polypropylene, along with polycarbonate or polyethylene panels. Unlike traditional glass greenhouses, plastic greenhouses offer a lightweight, cost-effective alternative, ideal for gardeners operating on a budget or with specific space constraints.

Key Features that Differentiate Plastic Greenhouses

The primary feature-based grouping for plastic greenhouses revolves around the materials used for their structure and covering. This guide will break down the key materials and characteristics that make plastic greenhouses unique compared to other greenhouse types.

1. Frame Materials

The frame of a plastic greenhouse is pivotal to its strength, stability, and durability. Here’s a detailed look at common materials:

• PVC (Polyvinyl Chloride):

  PVC is a lightweight, rust-resistant material often found in budget-friendly greenhouses. It’s easy to assemble and suitable for small to medium-sized structures.

• Polypropylene:

  Stronger than PVC, polypropylene is typically used in mid-range greenhouses. It offers enhanced weather resistance, making it ideal for more varied climates.

• Steel Reinforcement:

  Some plastic greenhouses incorporate steel frames covered with polycarbonate or plastic glazing, providing additional strength while retaining flexibility and lower costs compared to full metal structures.

2. Glazing or Covering Options

The choice of glazing or covering material has a direct impact on insulation, light transmission, and overall plant health within the greenhouse:

• Polycarbonate Panels:

  These durable, shatter-resistant panels come in single-wall and multi-wall configurations. The multi-wall variety excels in insulation, making it suitable for year-round use.

• Polyethylene Film:

  Used mainly in polytunnels, this UV-treated flexible covering is an affordable option for temporary growing needs but requires replacement every few years.

The Importance of Material Selection

Choosing the right materials is crucial for ensuring the longevity and effectiveness of your greenhouse. Plastic materials are lightweight and generally offer good resistance to rust and corrosion. However, they may have varying levels of durability and UV resistance, particularly under prolonged exposure. For example, while PVC frames are easy to handle, they can become brittle over time, whereas polypropylene frames offer better longevity.

3. Types of Plastic Greenhouses

Plastic greenhouses can be classified into several categories based on their frame and covering:

• Small Plastic Greenhouses:

  Perfect for limited spaces, these are ideal for beginners or those wishing to grow specific plants, like herbs or small vegetables.

• Walk-In Plastic Greenhouses:

  Offering more headroom and space, these structures allow for easier access and movement within the greenhouse, making them suitable for larger plants or for those who spend significant time gardening.

• Polytunnels:

  These are elongated structures covered in polyethylene film—perfect for growing crops that require more space while being cost-effective.

Practical Use Cases of Plastic Greenhouses

Understanding the variety of gardening applications that plastic greenhouses cater to can assist you in selecting the right structure:

• Vegetable Growing:

  Gardeners growing tomatoes, peppers, or cucumbers can benefit from the controlled environment of a plastic greenhouse.

• Flower Cultivation:

  Plastic greenhouses can help protect delicate flowers from harsh weather, while also providing them with the warmth they need to thrive.

• Seed Germination:

  Starting seeds in a well-controlled environment can lead to higher germination rates, ensuring a successful growing season.

Pros and Cons of Plastic Greenhouses

When contemplating a plastic greenhouse, it’s crucial to weigh both the advantages and disadvantages:

Advantages:

• Cost-effective: Generally cheaper than glass or metal alternatives.
• Lightweight: Easy to move and assemble, ideal for DIY installations.
• Weather Resistance: Resistant to rust and corrosion, ensuring longevity.
• Shatterproof: Polycarbonate panels provide added safety, especially in homes with children.

Disadvantages:

• Durability Concerns: Plastic frames may not withstand extreme weather conditions as well as wood or metal structures.
• UV Degradation: Prolonged exposure to sunlight can weaken PVC materials.
• Temperature Regulation: Polythene covering can offer less insulation, limiting seasonal use.

Why Choose a Plastic Greenhouse?

Plastic greenhouses present a compelling choice for gardeners seeking affordability and flexibility. Their lightweight design allows for easy transportation and setup, making them suitable for both seasoned gardeners and novices. Moreover, by carefully selecting the right frame and covering material, you can tailor your greenhouse to meet specific growing conditions, ensuring optimal health for your plants.

Top Features to Consider Before You Buy

Before committing to a plastic greenhouse, consider these essential factors:

• Size: Determine the space available in your garden and the number of plants you wish to cultivate.
• Frame Material: Choose between PVC and polypropylene based on your durability needs and budget.
• Glazing Type: Decide between polycarbonate panels for colder climates or polyethylene film for temporary use.
• Ease of Assembly: Opt for designs that allow for straightforward installation, especially if you plan to set it up yourself.

Common Mistakes to Avoid

When purchasing a plastic greenhouse, be mindful to avoid these common pitfalls:

• Overestimating Space Needs: Ensure your greenhouse fits comfortably in your garden, considering the height, width, and depth.
• Ignoring Ventilation: Choose models that incorporate vents or fans to prevent overheating and maintain humidity levels.
• Neglecting Maintenance Requirements: Regular cleaning and checks on the structure will extend its life and efficiency.

FAQs About Plastic Greenhouses

• How long will a plastic greenhouse last? Depending on the materials used and maintenance, expect a lifespan of 5-10 years for PVC models and longer for polypropylene and polycarbonate.
• Are plastic greenhouses easy to set up? Most models come with straightforward assembly instructions. Consider choosing those that claim ‘tool-free’ assembly for ease of use.
• Can I use a plastic greenhouse year-round? Yes, especially those with multi-wall polycarbonate panels, but keep in mind the insulating properties of your chosen materials.
• What should I do during the winter months? Insulate the greenhouse as necessary, and consider using heating cables or thermal blankets for frost-sensitive plants.

Tips from Experts

• Regularly monitor temperature and humidity levels to create the ideal indoor climate for your plants.
• Utilise fans or vents during warmer periods to improve air circulation.
• Experiment with different plants to discover which thrive best in your greenhouse conditions.

Conclusion

Plastic greenhouses offer an economical and versatile solution for gardeners seeking greater control over their growing conditions. With careful consideration of frame materials, coverings, and design, you can create an ideal environment for your plants. Explore the plastic greenhouse options available on WhatShed to find the perfect fit for your gardening aspirations.