Temperature and humidity measurement
These devices offer accurate and easy-to-read readings and often also have additional functions such as minimum and maximum values, alarms or the option to connect with other devices. Some advanced models can store measured data in memory and allow later analysis. Correct placement of the measuring device is key to obtaining accurate values. For example, a thermometer should not be placed directly near a heat source or in the sun, as this could distort the measured temperature.
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Temperature and humidity significantly determine the growing conditions of plants and the microclimate inside the grow box. This should be stable. Their mutual relationship is the key to a successful growing cycle and a juicy harvest. That is why it is very important to check these interconnected values at regular intervals using the appropriate measuring equipment.
You can choose thermometers and hygrometers according to the level of design:
For temperature during cultivation, it applies that leaves are able to retain more water vapour the warmer the air is. Just as the sun has a direct effect on temperature when growing outdoors, the intensity of light radiation affects the temperature inside the grow tent even when growing indoors. In a covered growing space, you can influence the temperature using heating or fans. Ideal temperatures for plants range from 24-27 °C during the day and 21-25 °C at night.
For cultivation purposes, humidity can be expressed as the proportion of water vapour in gaseous form in the air. Relative humidity (RH), expressed as a percentage, is also decisive. RH 100% would mean that the air contains the maximum possible amount of water vapour at a given temperature (the so-called dew point). Ideal air humidity for plants ranges between 40–60%. For seedlings, it is good to maintain higher air humidity of up to 80%.
Frequently asked questions
What is the difference between a thermometer without a probe and one with a probe?
A model without a probe measures where it is hanging. A version with a probe allows you to measure the temperature, and possibly also humidity, in a different place than where the display is - for example directly in the crop or in a separate space, without having to look there.
Why monitor temperature and humidity together?
Both values are closely related and determine how the plant evaporates water and takes up nutrients. Warm air can hold more humidity, so the temperature reading alone, without knowing the humidity, does not tell you the actual conditions in the box.
What is VPD and why is it useful?
VPD (vapour pressure deficit) combines temperature and relative humidity into a single value that describes how easily the plant evaporates water. Monitoring VPD helps fine-tune the climate more precisely than temperature and humidity alone.
How often should values be checked?
Continuous measurement is ideal, because values change with the lighting schedule and ventilation. Models with minimum and maximum memory will also show fluctuations that occurred in your absence during the day and at night.
- Do you know what VPD is? Discover the key to perfect conditions for plant development
- High temperatures when growing indoors. How can you avoid them?
- How is plant health related to root temperature?
Accurate awareness of the microclimate is an essential prerequisite for a successful harvest. Do not hesitate to ask us anything; we will be happy to make choosing equipment for measuring humidity and temperature easier for you. Just write to info@higarden.cz