Understanding optimum Temperature and Humidity for plants
Temperature and humidity are the main environmental factors, which determine plants’ growth and health levels. The optimum grow space temperature and humidity depend on the stage of plants’ life.

Clones need different humidity and temperature level than plants in the vegetative stage, and plants in the blooming stage also require different environmental conditions. To achieve the best harvest yields and top-quality crops, you must create the right atmospheric conditions at the right times.

Here’s a brief on the effects of temperature and humidity on plants’ growth, the connection between humidity and temperature how to set the best conditions for ideal plant development

How Does Temperature Affect Plants?
Plants’ biochemical processes for growth depend on an ideal temperature range within which plants will perform photosynthesis and other processes at maximum rates. Beyond this range, plants’ metabolic and biochemical processes will slow down and their development stops. Within a grow space, where you can control all growth factors such as light, CO2 levels, water, temperature, and nutrition, you must provide the best temperature range to optimize plant development and not restrict it.

You’ll find 3 main temperature points of plant growth, including the minimal temperature, optimal temperature, and maximum temperature:
  1. Vegetative phase, the ideal temperature for growth is 24 degrees Celsius and the best humidity level is 60%.
  2. Flowering stage, the ideal temperature/ humidity ratio is 28 degrees C/ 50%.
  3. When temperature levels exceed 30 degrees Celsius, plants’ enzymes don’t perform at optimum rates and the photosynthesis process stops.

The Link Between Temperature and Relative Humidity

Humidity measures the amount of water vapour in the air. A reduced humidity percentage in the air causes water loss from plants’ tissues. But a high humidity level can cause the development of microbial and fungal pathogens.

The ideal humidity levels for your grow space depend on the optimum temperatures needed for your plants to thrive and the growth stage they’re in

Relative humidity represents the amount of water vapour in the air relative to how much water vapour the air can hold at a specific temperature. The levels of relative humidity affect how plants open their stomata. Plants transpire through their stomata.

In warm temperatures, plants close their stomata to decrease water loss. But stomata also help your plants cool off. When the temperature is too high, plants close their stomata to conserve water, but they can’t move oxygen or carbon dioxide molecules. This leads to your plants suffocating on transpired gases and water vapours.

When plants transpire, the humidity levels around their leaves increases. When the relative humidity is too high, plants can’t make water evaporate or uptake any nutrients from the growing substrate. This, in turn, can cause your plants to rot. But in low relative humidity and high temperatures, your plants’ transpiration rates increase, which reduces the need for additional fertilisation.

Environmental control of factors such as light, temperature, and humidity is significant in relation to disease and pest management. When the relative humidity is too high, mould and bacteria can develop, causing your crops to die, or causing their roots to rot. Increased humidity also encourages pests to colonize the substrates and fungus gnats or larvae to feed on your plants’ roots. Optimum management of plants’ growth involves controlling the environment to encourage and boost photosynthesis, generative growth, and high harvest yields.

Identifying the Temperature in the Grow Space
To achieve top-quality crops, you must control and maintain optimum temperature and humidity levels in your grow room. If the environment is too cold or too hot, your crops will deteriorate.

If the humidity levels are not right, your plants’ growth will slow down. To identify and control the temperature in your grow room, use top-quality thermometers. You’ll find a variety of tools available on the market such as wireless temperature and humidity sensors, digital display thermometers, thermal hygrometers, and thermometer-hygrometers with external probes.

With the proper instruments, you can continuously collect and store the grow room temperature and humidity data.

You can adjust and set customised measurement intervals and monitor wide ranges of temperature and humidity levels.

You can also set alerts when these levels are exceeded to prevent any deterioration to your plants.

Control the Temperature in Your Grow Space
Optimum ventilation is crucial for successful plants’ growth. To remove excess heat, install extraction fans high inside your grow space.

Intake fans should be placed close to the ground, so cool air circulates through your plants’ leaves.

By making fresh air available to your plants, you’ll ensure a continuous supply of CO2, which is essential for the development of your plants. Depending on the conditions inside the grow space, you can set the fans to different speeds and maintain specific temperature levels.

The ideal room and humidity temperatures depend on the plants’ growth phase. These factors determine the level of your plants’ photosynthesis and other biochemical processes.

To measure the grow room temperature and humidity levels, you should use a hygrometer and thermometer. The digital options are the best as they provide current readings.

You’ll find a variety of models available, which allow for increased customisation.

To prevent your grow space from getting too hot, you can use extraction fans. Also, intake fans will help you circulate air through the leaves of your plants and remove any stale air.

To create the best environment for your plants to thrive, you should also consider other factors such as the levels of carbon dioxide, light, water, and nutrients. Establish a balance of all these factors to achieve increased harvest yields. They influence your plants’ development both in the short and long term.

With the right strategies and tools, you can create the perfect environmental conditions for your plants to grow healthy and strong. In optimum environmental conditions, you’ll achieve top-quality crops and extreme harvest yields, which deliver powerful flowering and exquisite fruiting.

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