How to Keep Vegetables From Getting Too Hot in a Greenhouse in the Summer

Growing vegetables in a greenhouse extends your normal growing season and creates an additional growing season in cold weather. If you intend to use your greenhouse all year round, however, you must be aware of the potential danger of heat to your plants as well as cold. Many vegetables are more tolerant of heat than they are of cold, but excessive heat can cause your plants to dry out, wilt and eventually die.

Instructions

- 1
  Place a thermometer in your greenhouse so that you can keep an accurate temperature record. Log the temperature at set times throughout the day, for example, at 10 a.m., 2 p.m. and 5 p.m. in order to get an idea of the current temperature trends.
- 2
  Determine at what temperature the vegetables you are growing in the greenhouse will start to suffer from excess heat. Researching the individual needs of each vegetable will help you understand what conditions you need to provide.
- 3
  Ventilate your greenhouse by opening the windows or rolling up the plastic sides and securing them with twine or Velcro. Many greenhouses have a way for the sides to be opened.
- 4
  Open the doors to the greenhouse and increase the ventilation by placing a fan at the doorway. This will increase air circulation and help reduce the temperature in the greenhouse and keep the plants from sitting in stale air.

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