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The Importance of Grow Room Environment for Cultivation

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Successfully cultivating cannabis involves more than merely planting a seed and watering it. For a thriving harvest, it's essential to establish the perfect grow room environment for your plants to flourish.

Temperature, humidity, and lighting are important factors to manage. You'll learn the importance of maintaining an ideal grow room environmental condition for your cannabis plants in this article.

Mastering Temperature and Humidity Control

In your cannabis cultivation facility, temperature and humidity are two of the most critical factors to manage. In humid climates, mold and mildew can grow, while plants may suffer from stress and dehydration in dry climates. As we move forward, let's consider the importance of managing humidity and temperature.

Temperature Regulation

Temperature management is a fundamental aspect of controlling cannabis growing conditions. It also influences other parameters, such as lighting and humidity. Temperature control is central to most growth chamber climate control systems due to its significance. Temperature and humidity are closely related and directly affect each other, making it impossible to grow cannabis without considering humidity.

Humidity Regulation

Humidity is another vital element to manage in a cannabis grow room, although it is often inadequately designed and executed. Excess humidity can produce molds that can devastate an entire cannabis crop and quickly spread under certain conditions, infecting healthy plants and causing significant damage. Insufficient humidity can also stress plants, leading to their demise. It is essential to find the right equipment to control your humidity environment.

Optimal Humidity and Temperature for Cannabis Growth

Now, let's delve into the perfect temperature and humidity levels for each phase of growth to guarantee a flourishing cultivation experience.

Seedling Phase

  • Humidity: 65-70%RH
  • Temperature:
  • 68-77°F (20-25°C) with lights on
  • 59-68°F (15-20°C) with lights off

In the seedling phase, plants have not yet developed their root systems. As a result, maintaining high humidity in the nursery or clone room diminishes leaf transpiration and alleviates stress on the emerging root systems, enabling them to grow before raising VPD and transpiration rates.

Some cultivators initiate clones and seedlings in mother or veg rooms, employing plastic humidity domes to preserve moisture (and occasionally heat). This approach permits sharing space with more mature plants without similar environmental restrictions. When using domes, ensure adequate ventilation to avert excessive moisture accumulation and facilitate CO2 exchange.

Vegetative Phase

·Humidity: 40-70%, progressively reduce in 5% steps periodically until reaching the target humidity for transitioning to flowering (do not go below 40%)

  • Temperature:
  • 71-82°F (22-28°C) with lights on
  • 64-75°F (17-23°C) with lights off

As plants progress to the vegetative phase, humidity is gradually decreased to prepare them for flowering. This fosters further root system development and supports expansive leaf growth and stem extension.

Commence the vegetative phase with a humidity level between 40% and 70%, and steadily decrease it until reaching the preferred humidity for the flowering phase. However, refrain from reducing humidity below 40% during the vegetative phase.

Flowering Phase

  • Humidity: 40-50%
  • Temperature:
  • 68-79°F (20-26°C) with lights on
  • 59-70°F (15-21°C) with lights off

For cannabis flowering, the ideal humidity range is 40% to 50%. Reducing relative humidity in this phase can help avert mold and mildew issues.

Maintaining cooler temperatures and lower humidity enables the perfect VPD balance. Steer clear of temperatures exceeding 79°F (26°C), particularly during the latter half of flowering, as high temperatures combined with low humidity can rapidly dehydrate plants, inducing stress and adversely affecting yields.

Late Flowering Phase

  • Humidity: 35-50%
  • Temperature: 64-75°F (18-24°C) with lights on
  • 59-66.2°F (15-19°C) with lights off

In the late flowering phase, it is crucial to sustain a marginally lower humidity range of 35% to 50%. This practice minimizes the likelihood of mold and bud rot in dense buds.

altaqua grow room environment The Importance of Grow Room Environment for Cultivation

Managing Temperature and Humidity

To maintain the optimal growing environment, you'll need equipment to manage the grow room's temperature and humidity. There are two primary methods for temperature and humidity control in the grow room.

Using a Combination of Dehumidifiers and Air Conditioners

This approach may be the most economical but has limitations. Standalone dehumidifiers release heat during operation, requiring more robust air conditioning to offset the temperature, leading to energy waste.

Additionally, installing multiple air conditioners and standalone dehumidifiers in large cannabis facilities increases installation and maintenance costs.

Using ALL-IN-ONE Temperature and Humidity Control Equipment

Grow room HVAC equipment, like Altaqua, combines air conditioning and standalone dehumidifier functions to help you manage temperature and humidity. It effectively controls temperature and humidity for optimal cannabis growth while maintaining a balanced environment without causing loss. This method also saves on installation and maintenance costs.

Balancing Lighting and CO2 Levels

Lighting and CO2 levels are also essential factors to consider when growing cannabis. In the vegetative phase of the cannabis plant, most strains need 18-24 hours of light; in the flowering stage, most songs need 12 hours of the morning. However, LED lights generate heat, so their lighting must match their temperature management.

CO2 levels should be monitored and maintained between 800-1200 ppm to promote healthy growth and increase production. The appropriate level varies from day to night and depends on the stage of development. High-quality grow lights and CO2 generators can help you achieve optimal lighting and CO2 levels in your grow room.

Ensuring Proper Airflow and Ventilation

Maintaining proper airflow and ventilation is vital for a healthy environment in your cannabis grow room. Stagnant air can lead to mold and mildew growth, damaging your plants and posing a health risk.

Nutrient and PH Management

Cannabis harvest success requires more than proper air circulation and ventilation. Nutrients and pH management are crucial. At different stages of growth, cannabis plants require specific nutrients, and the right balance of nutrients is crucial to their health.

The pH level also affects nutrient absorption, making monitoring and adjusting pH levels as needed to avoid nutrient deficiencies or toxicities essential. The best way to make sure that your cannabis plants thrive is to invest in a high-quality nutrient and pH management system.

Pest and Disease Prevention

Another critical aspect of environmental control in cannabis cultivation is pest and disease prevention. Cannabis plants are susceptible to various pests and diseases, which can quickly spread and damage your entire crop.

Implementing preventative measures such as regular inspections, proper sanitation practices, and natural pest control methods can help keep plants healthy and free from infestations.

It's also important to quarantine any new plants or equipment before introducing them to your grow room to prevent the spread of pests or diseases.


Creating and maintaining the perfect grow room environment is crucial for cannabis growers. By investing in the right grow room environmental controls, you can maximize yields, potency, and overall plant health. Whether you're a small-scale home grower or a commercial cannabis facility, understanding how to control your grow room environment can make all the difference.

If you have any different opinions or other ideas, please don't hesitate to contact us.


1.What is the ideal vegetative temperature and humidity during light-on period?

The ideal vegetative temperature and humidity for cannabis is 71-82°F (22-28°C) and 40-70% respectively. These conditions promote healthy growth.

2.How do you control climate in a grow room?

To control climate in a grow room, use an HVAC system to control temperature and a dehumidifier for humidity. Fans and vents can improve airflow.

3.How do I get fresh air in my grow room?

Install exhaust fans and intake vents to get fresh air in your grow room. These provide air exchange and prevent stagnant air buildup.

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