Shade Cloth On A Greenhouse


When to put shade cloth on a greenhouse? This is a common question among greenhouse enthusiasts and professional growers alike. Shade cloth is a crucial tool for managing the internal climate of a greenhouse, protecting plants from excessive heat and light.

By providing a controlled environment, shade cloth helps ensure optimal growing conditions, which can significantly enhance plant health and yield.Understanding the right time to install shade cloth, how to properly use it, and how to maintain it seasonally are essential aspects of greenhouse management.

In this article, we will explore these topics in detail, providing practical advice for both amateur gardeners and seasoned growers. We will also discuss how to combine shade cloth with other cooling methods to achieve the best results for your greenhouse.

Why Use Shade Cloth in a Greenhouse

Shade cloth is an essential tool for anyone managing a greenhouse. Its primary function is to regulate the amount of sunlight that enters the greenhouse, which in turn helps control the internal temperature and light intensity. Here are several reasons why using shade cloth in a greenhouse is beneficial:

  • Temperature Control: Shade cloth helps reduce the temperature inside the greenhouse by blocking a portion of the sunlight. This is especially important during the hot summer months when excessive heat can stress or even damage plants.
  • Light Regulation: Different plants have varying light requirements. Shade cloth allows you to create a suitable light environment for plants that may not thrive under direct, intense sunlight.
  • Prevention of Sunburn: Just like humans, plants can suffer from sunburn. Shade cloth helps protect plants from harmful UV rays that can cause leaf burn and reduce plant vitality.
  • Energy Efficiency: By moderating the temperature naturally, shade cloth can reduce the need for artificial cooling systems, thus saving energy and lowering operational costs.
  • Enhanced Growth Conditions: With controlled temperature and light, plants can grow more uniformly and healthily, which can lead to better yields and higher-quality produce.

By understanding and utilizing shade cloth effectively, greenhouse managers can create an ideal environment that supports plant health and maximizes productivity.

When to Put Shade Cloth on a Greenhouse

Put shade cloth on a greenhouse when temperatures start to exceed 85°F (29°C) regularly, typically in late spring or early summer. This helps to protect plants from excessive heat and light, preventing sunburn and reducing heat stress. Here’s how to determine the best time to put shade cloth on your greenhouse:

1. Monitor Temperature

Start considering a shade cloth when the daily temperatures consistently begin to exceed the optimal range for your plants. Most plants prefer temperatures between 70°F to 85°F (21°C to 29°C). If your greenhouse regularly exceeds these temperatures, it’s time to think about shading.

2. Check Light Intensity

If your plants are showing signs of light stress, such as yellowing leaves, scorched spots, or wilting despite adequate watering, it might be a sign that they are receiving too much direct sunlight. A shade cloth can help diffuse the light and protect the plants.

3. Seasonal Changes

Typically, shade cloths are more necessary during the late spring through early fall, when the intensity of the sun is greatest. However, this can vary based on your geographic location.

4. Type of Plants

Consider the specific needs of the plants in your greenhouse. Some plants, like certain types of orchids and ferns, require lower light levels and cooler temperatures. Shade cloth can be applied earlier in the season for these plants compared to those that are more tolerant of heat and light

5. Geographical Location

Your geographical location plays a significant role. In hotter climates, you might need to apply shade cloth earlier in the year and keep it on for a longer duration. Conversely, in cooler regions, it might only be necessary during the peak of summer.

6. Greenhouse Orientation and Design

The design and orientation of your greenhouse can affect when you need shade cloth. Greenhouses with extensive glazing facing south or west will heat up more quickly and may require shade cloth sooner.

7. Type of Greenhouse:

The material of your greenhouse can also influence when to add shade cloth. For example, polycarbonate greenhouses might insulate better and delay the need for shading compared to those made with clear glass.

Here’s a simple guide to help determine the timing:

Factor Indicator Suggested Action
Temperature Exceeds 70°F to 85°F (21°C to 29°C) Install shade cloth
Light Intensity Signs of light stress (yellowing, scorched spots) Install shade cloth
Seasonal Changes Late spring through early fall Install shade cloth
Type of Plants Light-sensitive plants (e.g., orchids, ferns) Install shade cloth earlier
Geographical Location Hot climates Install earlier, keep longer
Greenhouse Orientation/Design South or west-facing glazing Install shade cloth sooner
Type of Greenhouse Material type (e.g., polycarbonate vs. glass) Adjust timing based on insulation ability

Generally, you’ll want to install the shade cloth before the temperatures start to peak, to prevent heat accumulation in the greenhouse. By keeping an eye on these factors, you can ensure that you put up shade cloth at the right time, providing the best possible environment for your plants.

How to Use Shade Cloth in a Greenhouse

Using shade cloth in a greenhouse effectively requires understanding the proper installation techniques and selecting the right type of cloth for your plants’ needs. Here are some straightforward steps to help you get started:

  • Select the Right Shade Cloth: Shade cloths come in various densities, usually ranging from 30% to 90% shade. Choose a density based on the light requirements of your plants. For instance, vegetables may need 30-50% shade, while orchids might require 70-90%.
  • Measure Your Greenhouse: Before purchasing, measure the dimensions of your greenhouse to determine how much shade cloth you will need. Include enough material to cover the sides if necessary.
  • Cut the Shade Cloth: Once you have your measurements, cut the shade cloth to size. Ensure you have some extra material to allow for fastening and adjustments.
  • Install Mounting Hardware: Install hooks, clips, or ropes around the perimeter of your greenhouse. This hardware will support the shade cloth and keep it in place.
  • Attach the Shade Cloth: Secure the shade cloth to the mounting hardware. Start at one end and work your way to the other, ensuring the cloth is taut but not overly stretched. This helps prevent wind damage and ensures even shading.
  • Adjust as Needed: Check the shading throughout the day. Adjust the cloth to ensure your plants are receiving the right amount of light. In some cases, you might need to add or remove sections to optimize light conditions.
  • Regular Maintenance: Inspect the shade cloth regularly for wear and tear. Make any necessary repairs to keep it in good condition and replace it if it becomes too damaged.

Here is a simple guide for selecting the right shade cloth density:

Plant Type Recommended Shade Cloth Density
Vegetables 30-50%
Flowers 40-60%
Orchids 70-90%
Ferns 70-90%
General Use 50-60%

By following these steps, you can effectively use shade cloth to create a more controlled and suitable environment for your plants, ensuring they thrive even in the hottest conditions.

Seasonal Maintenance Tips for Greenhouse Shade Cloth

Maintaining your greenhouse shade cloth is essential to ensure its longevity and effectiveness. Proper seasonal maintenance can help you avoid potential issues and keep your greenhouse in optimal condition throughout the year. Here are some straightforward tips:

1. Spring Preparation:

  • Inspect for Damage: Before the growing season begins, inspect the shade cloth for any tears, holes, or worn areas. Repair or replace damaged sections as needed.
  • Clean the Cloth: Remove any dirt, dust, or debris that may have accumulated over the winter. Use a mild soap and water solution to gently clean the cloth.
  • Check Fastenings: Ensure that all hooks, clips, and ropes are secure and in good condition. Replace any that are rusty or broken.

2. Summer Monitoring:

  • Adjust for Growth: As plants grow, their light needs may change. Monitor plant health and adjust the shade cloth as necessary to provide optimal light levels.
  • Watch for Wear and Tear: The intense summer sun and occasional storms can cause wear. Regularly inspect the shade cloth and fix any emerging issues promptly.
  • Ensure Ventilation: Make sure that the shade cloth is not obstructing ventilation systems. Proper airflow is crucial during the hot months.

3. Autumn Transition:

  • Gradual Removal: As temperatures begin to drop, start removing sections of the shade cloth to allow more sunlight to enter and keep the greenhouse warm.
  • Clean Before Storage: If you plan to remove the shade cloth for the winter, clean it thoroughly before storage. Ensure it is completely dry to prevent mold and mildew.
  • Store Properly: Fold the shade cloth neatly and store it in a dry, cool place. Avoid areas where it could be exposed to pests or extreme conditions.

4. Winter Care:

  • Protect Against Snow and Ice: If you leave the shade cloth on during winter, make sure it can withstand snow and ice accumulation. Remove snow promptly to prevent damage.
  • Periodic Checks: Even in winter, it’s a good idea to periodically check the shade cloth and fastening systems for any signs of wear or damage caused by harsh weather.

Here’s a quick seasonal maintenance checklist:

Season Maintenance Task
Spring Inspect for damage, clean the cloth, check fastenings
Summer Adjust for plant growth, watch for wear and tear, ensure ventilation
Autumn Gradual removal, clean before storage, store properly
Winter Protect against snow and ice, periodic checks

By following these seasonal maintenance tips, you can keep your greenhouse shade cloth in excellent condition, ensuring it provides the best possible protection and climate control for your plants year-round.

Combining Shade Cloth with Other Greenhouse Cooling Methods

Combining shade cloth with other cooling methods can enhance the efficiency of your greenhouse and provide a more stable environment for your plants. Here are several ways to integrate shade cloth with other cooling techniques:

1. Ventilation:

  • Natural Ventilation: Open doors, windows, and vents to allow hot air to escape and cooler air to circulate. Shade cloth helps reduce the intensity of sunlight, while ventilation ensures that heat does not build up inside the greenhouse.
  • Mechanical Ventilation: Use fans to improve air circulation. Exhaust fans can pull hot air out, while intake fans can draw cooler air in. This method works well in combination with shade cloth to maintain a consistent temperature.

2. Evaporative Cooling:

  • Misting Systems: Install misting systems that spray a fine mist of water. As the water evaporates, it cools the air. Shade cloth can prevent the greenhouse from becoming too hot, making the misting system more effective.
  • Wet Walls: These are panels soaked with water through which air is drawn. The evaporation of water cools the air. Using shade cloth reduces the overall temperature, enhancing the cooling effect of wet walls.

3. Thermal Screens:

  • Double-Layer Shade Cloth: Use a combination of internal and external shade cloths. The external shade cloth blocks the majority of the sunlight, while the internal one provides an additional layer of cooling.
  • Thermal Screens: These can be rolled out inside the greenhouse to reflect heat away and provide insulation. Combining thermal screens with shade cloth can significantly reduce heat during the day and retain warmth at night.

4. Water Features:

  • Water Tanks: Placing water tanks inside the greenhouse can help moderate the temperature. The water absorbs heat during the day and releases it at night. Shade cloth helps keep the overall temperature lower, enhancing the water tanks’ effectiveness.
  • Reflective Pools: Small reflective pools inside the greenhouse can help cool the air through evaporation. Shade cloth prevents excessive heat, ensuring that the water remains effective in cooling.

Here’s a quick overview of combining cooling methods with shade cloth:

Cooling Method How It Works Benefits with Shade Cloth
Ventilation Circulates air to remove heat Prevents heat build-up and ensures airflow
Evaporative Cooling Uses water evaporation to cool the air Enhances effectiveness by lowering initial heat
Thermal Screens Reflects heat and insulates Provides double-layer cooling and insulation
Water Features Absorbs and releases heat Keeps water cooler, enhancing temperature regulation

By integrating shade cloth with these cooling methods, you can create a more controlled and comfortable environment in your greenhouse, ensuring your plants thrive even during the hottest days.


In summary, using shade cloth in a greenhouse is essential for protecting plants from excessive heat and light, ensuring their health and productivity throughout various seasons.

The timing for installing shade cloth should align with seasonal changes, taking into account the specific needs of the plants and local climate conditions. Regular maintenance of shade cloth, combined with other cooling methods, can significantly enhance the environment within your greenhouse.

For those seeking effective solutions for their greenhouse needs, consider reaching out to QiBang Netting for high-quality shade cloths tailored to your specific requirements. Optimal plant growth and a cooler greenhouse are just a consultation away with QiBang Netting.

FAQ about Greenhouse Shade Cloth

1. What is shade cloth, and why do I need it for my greenhouse?

Shade cloth is a woven or knitted fabric used to provide shade. It helps control the temperature inside the greenhouse by blocking out a portion of the sunlight, preventing overheating and protecting plants from excessive UV exposure.

2. How do I choose the right shade cloth for my greenhouse?

Choose shade cloth based on the needs of your plants and the climate in your area. Shade cloths come in different percentages, indicating how much sunlight they block. For most greenhouses, a 30-50% shade cloth is sufficient, but some plants may require up to 70% shade.

3. How do I properly install shade cloth on my greenhouse?

To install shade cloth, secure it tightly over the exterior of your greenhouse using clips, ropes, or bungee cords. Make sure it is evenly spread to provide consistent shade and prevent it from flapping in the wind.

4. Can shade cloth be used year-round?

While shade cloth is primarily used during the warmer months, it can be beneficial year-round in regions with intense sunlight. However, in areas with cold winters, it is usually removed to allow maximum sunlight and warmth during the colder months.

5. Does shade cloth reduce heat in a greenhouse?

Yes, shade cloth reduces heat in a greenhouse by blocking a portion of the sunlight, lowering the temperature inside. The cooling effect depends on the density of the shade cloth, creating a more controlled environment and protecting plants from heat stress.

6. Are there any alternatives to shade cloth for greenhouse cooling?

Yes, alternatives include using whitewash or shading paint on the greenhouse roof, installing shade screens, and incorporating natural shading from nearby trees or structures. Each method has its benefits and can be used in combination for best results.