Why is greenhouse humidity important?

Humidity affects a plant's ability to transpire (release water), which is how it cools itself and draws up nutrients. Too low humidity can cause stress and wilting. Too high humidity can promote fungal diseases like powdery mildew and botrytis.

What is an ideal humidity level?

This depends on the crop and its growth stage. Generally, 50-70% is a good range for many plants. Seedlings often prefer higher humidity (70-80%), while plants in the flowering stage may benefit from slightly lower humidity (40-60%) to prevent mold.

How do I add or remove humidity?

To add humidity, you can use misters, foggers, or simply wet down pathways. To remove humidity, you need to use ventilation (exhaust fans) to exchange the moist indoor air for drier outdoor air, or use a dehumidifier.

Greenhouse Humidity Calculator

Calculate the amount of water to add or remove to adjust humidity.

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