Key Takeaways -

• Proper shading in a greenhouse helps prevent overheating and promotes healthy plant growth.
• External shade netting and shade paint are cost-effective options for temperature control.
• Automated shading systems offer precise control but come with higher installation costs.
• Choosing the right shading material and percentage is crucial for balancing light and heat levels.

Too much direct sunlight in a greenhouse can cause plants to overheat, scorch, and struggle to grow. The right shading helps keep temperatures balanced and plants healthy.

This article will cover seven simple ways to provide shade in a greenhouse, from easy options like shade netting to more advanced solutions like automated blinds. You'll learn how each method works and which one is best for your setup.

Keep reading to find out how to protect your plants from too much sun and create the perfect growing environment. No matter the size of your greenhouse, having the right shading can make all the difference.

External Shading Methods

#1 External Shade Netting or Cloth

External shade netting or cloth is a simple and effective way to reduce heat inside a greenhouse. Made from UV-resistant materials like plastic weave, hessian, or green shade netting, it blocks excess sunlight before it reaches the glass.

Installation is easy—secure it with clips or suction cups or weigh down the edges with bricks or stones. This method is highly effective at cooling and can be adjusted seasonally. However, it may obstruct roof vents and is vulnerable to strong winds and rain, requiring regular checks to ensure it stays in place.

#2 Temporary Shading Structures

Temporary shading structures, such as patio umbrellas or DIY shade frames, offer a flexible solution for small greenhouses. These options are easy to move and adjust, making them ideal for providing shade only when needed.

They are particularly useful for targeting specific areas within the greenhouse. However, they are less effective for larger setups and require manual adjustment throughout the day to ensure plants receive the right amount of sunlight.

While convenient, they are best used as a short-term or supplemental shading solution rather than a primary method.

#3 Shade Paint

Shade paint is applied directly to the exterior of greenhouse glass to reflect sunlight and reduce internal temperatures. Traditional whitewash, like Coolglass, is affordable but must be removed at the end of the summer. Weather-sensitive paints, such as Nixol, adjust to moisture levels, becoming clear when wet.

Shade paint is long-lasting and low-maintenance and works well on glass, plastic, or polycarbonate greenhouses. However, it requires annual reapplication and can be difficult to apply on large structures.

For commercial or large greenhouses, drone application services are available in the UK, making the process quicker and more efficient.

Internal Shading Methods

#4 Internal Shade Netting

Internal shade netting is a practical way to reduce sunlight inside a greenhouse without exposing materials to harsh weather. Made from plastic weave netting or shade cloth, it is secured with standard greenhouse clips or suction cups. This method is easy to install, adjust, and remove as needed.

It also allows ventilation by being positioned below roof vents. However, it is less effective at cooling compared to external shading and can block too much light if overused, potentially affecting plant growth.

Despite these limitations, it remains a reliable and low-maintenance shading solution for many greenhouse owners.

#5 Curtains or Blinds

Curtains or blinds provide an adjustable shading solution for greenhouses. Options include household curtains or specially designed greenhouse blinds.

External blinds are more effective at blocking heat but tend to be expensive, while internal blinds are a more affordable alternative, though slightly less effective. Both options are durable, reusable, and allow for easy light control.

However, blinds can be costly, and external versions require sturdy installation to withstand weather conditions. While this method offers flexibility, it is best suited for gardeners who need a long-term, adjustable shading solution that can be adapted to seasonal changes.

Advanced Shading Systems

#6 Automated Shading Screens

Automated shading screens offer precise control over light and temperature by using movable screens on a sliding system. Commonly used in commercial greenhouses, they are also a great option for dedicated hobbyists looking for efficiency.

These systems can be programmed to adjust automatically based on sunlight levels, reducing heat buildup while still allowing enough light for healthy plant growth. While they provide excellent shading control with minimal effort, the biggest drawback is the high installation cost.

For larger greenhouses or those needing a long-term, hassle-free solution, automated shading screens can be a worthwhile investment.

#7 Integrated Blinds

Integrated blinds provide a sleek, long-lasting shading solution with adjustable levels to control light and temperature. These high-quality internal blinds can reduce damaging temperatures by up to 5°C, helping to create a stable environment for plants.

Built for durability, they resist wear and tear, making them a low-maintenance option. While they are highly effective, they often require professional installation, which can add to the overall cost.

For gardeners looking for a reliable and efficient shading system, integrated blinds offer a balance of performance and longevity, making them a smart choice for both small and large greenhouses.

Choosing the Right Greenhouse Shading Material

Shade Value / Shade Percentage

The shade value, or shade percentage, determines how much sunlight is filtered through the shading material. Choosing the right percentage depends on your plants' light and heat requirements.

• 30%-40% – Best for sun-loving plants like tomatoes, allowing as much light as possible while reducing excess heat.
• 50%-60% – Ideal for general greenhouse use, providing a balance between light and temperature control.
• 80%+ – Suitable for delicate plants that need minimal direct sunlight, offering maximum protection from intense heat.

Colour of Shade Material

The colour of shade material plays a key role in temperature control and plant growth (1). Choosing the right one depends on your climate and the specific needs of your greenhouse plants.

• White shade cloth: Reflects the most sunlight, significantly helping greenhouse temperatures fall.
• Black shade cloth: Absorbs heat but provides uniform shading, making it a good option for general use.
• Green shade netting: Reflects green light, which plants don’t use for photosynthesis, helping to maintain lower temperatures while allowing enough light for growth.

Frequently Asked Questions

Which Method Is Best to Provide Partial Shade to My Greenhouse?

The best method to provide partial shade to your greenhouse is by using shading netting or mesh. You can choose from different shading percentages, depending on how much light you want to filter. Additionally, you can use shade cloths, which are easy to install and provide effective coverage.

Position the netting or cloth in a way that it doesn't obstruct air circulation, allowing your plants to thrive while protecting them from intense sunlight.

When Is the Best Time to Put Up Greenhouse Shading UK?

The best time to put up greenhouse shading in the UK is during the spring, before the weather gets too warm. Installing shading before the summer heat hits can help prevent scorch plant leaves, as it reduces the intensity of direct sunlight.

Early spring is ideal, as it gives your plants time to acclimatise to the filtered light, ensuring healthier growth throughout the warmer months.

Conclusion

In conclusion, providing shade in a greenhouse is essential for maintaining an optimal environment for plant growth.

Whether you choose external shade netting, shade paint, or more advanced systems like automated shading screens or integrated blinds, the right solution depends on your greenhouse setup and the specific needs of your plants.

For those looking to further enhance temperature control, a greenhouse cooler can be a great addition to complement your shading methods. By selecting the appropriate shading techniques, you can ensure your plants stay healthy and protected, no matter the season.

Sources -

1. https://theeverydaygreenhouse.com/shade-cloth/