Which humidifier to choose for my growing area?
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How to choose a humidifier based on the growing area and misting flow rate?
Maintaining an optimal humidity level is essential to ensure healthy and vigorous plant growth, whether in indoor growing, greenhouses, or grow rooms. The choice of humidifier mainly depends on the growing area and the misting flow rate, expressed in liters per hour (L/h).
In this article, we will help you choose the most suitable humidifier for your growing space, considering common dimensions such as 60x60 cm, 80x80 cm, 100x100 cm, 120x120 cm and more.
1. Why is humidity essential in indoor growing?
Relative humidity directly influences plant metabolism. Insufficient humidity can cause excessive evaporation, slowing growth and drying out foliage. Conversely, too high humidity can promote fungal diseases and mold development.
Needs vary according to the plant development stage:
- Germination and cuttings : 70-80 %
- Vegetative growth : 50-70 %
- Flowering : 40-50 %
To maintain these humidity levels, it is crucial to choose a humidifier suitable for the size of your tent or growing space.
2. Which humidifier capacity to choose based on the area?
The flow rate of a humidifier is measured in liters of mist generated per hour (L/h). The larger the space, the more powerful the humidifier must be. Here is an indicative table of humidification needs according to the sizes of the most common grow tents:
| Growing area | Area (m²) | Recommended flow rate (L/h) |
|---|---|---|
| 60x60 cm | 0.36 m² | 0.3 to 0.8 L/h |
| 70x70 cm | 0.49 m² | 0.5 to 1 L/h |
| 80x80 cm | 0.64 m² | 1 to 2 L/h |
| 90x90 cm | 0.81 m² | 1.5 to 2.5 L/h |
| 100x100 cm (1m²) | 1 m² | 2 to 4 L/h |
| 120x120 cm | 1.44 m² | 3 to 5 L/h |
| 150x150 cm | 2.25 m² | 5 to 8 L/h |
| 200x200 cm | 4 m² | 8 to 12 L/h |
| 240x120 cm | 2.88 m² | 6 to 10 L/h |
| 300x150 cm | 4.5 m² | 10 to 15 L/h |
| 300x300 cm | 9 m² | 15 to 20 L/h |
| 600x300 cm | 18 m² | 25 to 35 L/h and more |
- The larger the area, the more powerful the humidifier must be to ensure a homogeneous diffusion of humidity.
- Below 120x120 cm, an ultrasonic humidifier is generally sufficient.
- From 150x150 cm, it is better to choose an evaporative humidifier with a larger reservoir.
- Beyond 4 m², industrial models are recommended to maintain stable humidity over the entire surface.
See the humidifiers available in the shop
PS: If you use a large space (300x150 cm or more), it is advisable to distribute several humidifiers rather than using a single one that is too powerful. This helps prevent the formation of moisture pockets and ensures better distribution throughout the grow area.