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nebula trying to understand vpd in grow room
- Thread starter tree dawg
- Start date
For those not familiar with VPD, it's talking about the fact that temperature and relative humidity (RH) are closely related to each other. For example, Warm air can "hold" more evaporated water than cool air.
Plants can thrive at different relative humidities depending on the temperature of the air. Once the air becomes too saturated with water, it will tend to form dew or films of water over leaves, which leads to mold. When it's too dry, the leaves get stressed.
Ideally, you want to keep your temperature around 70-85°F and around 50% relative humidity. Increasing humidity can help lower the VPD if it's hot, and lowering the humidity will raise the VPD if it's cold. In other words, you can help plants deal with heat by adding humidity, and you can help plants deal with cold by removing humidity.
But honestly the best thing you can do is see how comfortable you feel in the grow space. In general, if it feels comfortable to you, it's probably good for your plants. I think it's easier to think of it that way than to try to follow a chart
Additionally, each plant is different, and it's important to watch them for signs of stress!
Plants can thrive at different relative humidities depending on the temperature of the air. Once the air becomes too saturated with water, it will tend to form dew or films of water over leaves, which leads to mold. When it's too dry, the leaves get stressed.
Ideally, you want to keep your temperature around 70-85°F and around 50% relative humidity. Increasing humidity can help lower the VPD if it's hot, and lowering the humidity will raise the VPD if it's cold. In other words, you can help plants deal with heat by adding humidity, and you can help plants deal with cold by removing humidity.
But honestly the best thing you can do is see how comfortable you feel in the grow space. In general, if it feels comfortable to you, it's probably good for your plants. I think it's easier to think of it that way than to try to follow a chart
Additionally, each plant is different, and it's important to watch them for signs of stress!