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Why Greenhouse Plants Need Ventilation




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Plants need fresh air just like people do- maybe even more so since they can’t walk outside for a breath of fresh air when they’re feeling suffocated. That’s why it’s essential to provide ventilation for greenhouse plants to ensure that they get the oxygen they need to grow.

One way to provide ventilation is by opening the doors and windows of the greenhouse regularly. This will help to circulate the air and prevent the build-up of dangerous gases. However, it’s also essential to ensure the greenhouse isn’t open too long, as this can lead to heat loss and make it difficult to maintain the ideal temperature for plant growth. Another way to provide ventilation is by installing a fan, which will help to circulate the air without causing too much heat loss. You can help your plants grow strong and healthy by providing adequate ventilation.

Why Greenhouse Plants Need Ventilation

In a greenhouse, proper ventilation helps your plants thrive. It helps prevent overheating, eliminates excess humidity, and keeps your greenhouse cool to avoid fungal and pest infestations. In this article, we’ll go over why greenhouse ventilation is so essential for your plants. So, what’s the best way to do this? Read on to find out more! Listed below are some tips to keep your greenhouse adequately ventilated.

Ventilation in A Greenhouse Helps to Prevent Overheating

Proper ventilation is essential for greenhouses and can be achieved through various means. One way to control temperature and airflow is to install fans on the top of the greenhouse. They should be located at the height of three feet above the floor. Ventilation can also be achieved by placing louvers behind the fan. You can also use heat-detecting automatic vent openers to control airflow and temperature.

Ventilation in A Greenhouse
Ventilation in A Greenhouse

Proper ventilation is vital for preventing overheating and condensation. It allows cooler air to circulate through the greenhouse and avoids overheating.

It may be necessary to vent for greenhouses in hot climates several times per day. In cooler temperatures, you can reduce the amount of ventilation and keep the greenhouse warm. Using materials such as trees and shrubs, you can also provide shade for the plants.

It Helps to Remove Excess Humidity

In a greenhouse, one of the most effective methods for removing excess humidity is by venting the air. Air can hold up to two times as much water vapor as it does at room temperature. Most greenhouses operate between 40 and 90 degrees Fahrenheit, so any temperature change will double or even triple the air’s water-holding capacity. Furthermore, a 20-degree increase in the dry bulb temperature will cut the relative humidity in half.

Although heating and ventilation are critical for reducing humidity, they must be combined.

Ventilation replaces outside air with more relaxed, drier greenhouse air. Ventilation works best when the outside air is significantly more relaxed than the greenhouse’s temperature. If the outside air is too humid, the greenhouse will chill and increase heating costs. Humidity levels may rise considerably without proper ventilation, resulting in excessive crop loss.

It Helps Prevent Fungal Problems

Keeping the greenhouse clean and debris-free is essential to prevent fungal problems. Plant debris can harbor pathogens and be introduced to the growth medium through soiled objects. A University of Maine plant pathologist points to the role of fungus gnats and shore flies in the proliferation of fungal diseases. These pests, whose larvae feed on decaying organic matter and plant roots, are deadly to plants.

Powdery mildew is a common fungus affecting many crop crops in greenhouses. It is easily detected by the presence of a white fine coating on the leaf surface. Plants that develop this disease may also exhibit brownish scab-like symptoms. Fungicides are an effective way to control powdery mildew. To prevent this fungus from affecting your crops, apply fungicides at the onset of infection. Rotate between different fungicides and systemic fungicides.

It Helps Prevent Pest Infestations

Taking the time to disinfect your equipment and surfaces is vital in preventing pest infestations in greenhouses. Using insecticidal soap or Epsom salt can kill most pests, but sensitive plants may need a sticky card instead. Apply the soap or Epsom salt directly to the leaves and stems of plants and repeat every five or seven days.

To be sure that pests are eradicated, isolate infected plants and sanitize them afterward.

The number one defense against pest insects is sanitation. Proper sanitation is the first line of defense against insect infestations in greenhouses. Regularly cleaning and removing dead vegetation from plants helps control insect infestations. Weekly inspections of plants should be conducted, and specific areas should be monitored closely. If the infestations persist, you can establish a quarantine area where pests cannot be introduced. Then, observe the plants for any signs of pests.


A greenhouse needs ventilation to prevent overheating, excess humidity, and fungal problems. Insect infestations can also be controlled by taking proper sanitary precautions. Following these tips can keep your plants healthy and free of pests.

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