Growing Medical Cannabis in a Greenhouse for Good Humidity Control

In recent years, the legal cannabis industry has grown in strength globally, after several countries legalized the medicinal, and even recreational use of the substance due to its widespread acceptance in the medical community as a legitimate course of treatment for various diseases.

A trend of strong growth is expected in the coming years, in a market already estimated at around US$165 billion. Most of this growth is expected in Canada, the United States, Europe, and South America.

Due to the legalization of its production and consumption, and the subsequent increase in demand, the crop is in strong expansion.

Cannabis cultivation, widespread in many parts of the world, takes place outdoors and in greenhouses.

Indoor cultivation allows accurate control of the multiple variables that affect the optimal cultivation of the cannabis plant.

Greenhouse cultivation allows the combination of various techniques, and therefore, the advantages of both indoor and outdoor cultivation.

Why Humidity Control is Important in Medical Cannabis Production

One of the most important factors in the development of the cannabis plant is moisture control. Correct control of relative humidity affects various aspects of cultivation, such as the assimilation of nutrients, perspiration, and growth.

Incorrect control will result in below-expected growth results or even lead to total crop failure.

Low relative humidity will cause the plant to close its stomata, leading to nutrition problems, and focusing resources on staying hydrated, rather than developing.

Excessively high relative humidity can lead to slow growth, and cause fungi, mould and bacteria to proliferate.

Each of the phases of cannabis cultivation requires a different range of relative humidity, the following values being a reference guide for an optimal crop:

  • Cloning phase: 60-75%
  • Vegetative phase: 40-60%
  • Flowering phase: 40-50%
  • Drying phase: 30-50%
  • The typical temperature range throughout all phases of the crop will vary between 16°C and  30°C.

Fisair: Specialists in Humidifiers and Dehumidifiers for Medical Cannabis Cultivation

Humidifiers / Evaporative Coolers

    AtomSpray Series


    • Adiabatic cooling and humidification system.
    • Mist spray gives rapid cooling and humidification of dry air.
    • Reduces costs up to 55% compared to other high-pressure humidifiers.
    • Hygienic – works with closed circuit of water/compressed air.
    • Uses inorganic materials.
    • Low maintenance.

    HEF7 Series


    • Adiabatic cooling and humidification system.
    • Reduction of energy consumption in water cooling of up to 20%.
    • High-efficiency organic or inorganic evaporative panel in stainless steel frame.

Condensation dehumidifiers

    IT / ST Series


    • Designed for use in high latent load environments.
    • 24-hour operation.
    • Full control of humidity and ambient temperature.
    • External condenser.
    • Suitable for applications where simultaneous control of both parameters is required.

Desiccant Rotor Dehumidifiers

    DFRA Series


    • System based on water vapour retention.
    • High-performance silica gel desiccant rotor.
    • Option of relative humidity control in proportional mode.
    • Temperature control.

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