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Humidity levels??

I was trying to make this way more complicated than it actually is. I was thinking it required specialty equipment such as a humidistat controlled humidifier/dehumidifier. I've already got an ac unit that has a dehumidifier mode, a small evaporative type humidifier, a thermostat-controlled electric heater, and monitoring meters. I live in the mid-south where humidity is my biggest issue -- too low in the winter, too high in the summer. Up until now, my goal was to keep the temperature in the 70ish degree range and the humidity in the 50-60 range. I check my plants daily and adjust the equipment as necessary to try to maintain that. According to the VPD chart, those figures are about right. Even the blind sow finds an acorn every now and then. If I read the instructions correctly, I want a VPD of .8 for seedlings, 1.0 for veg, and 1.2 - 1.5 for flower. I'll pay attention to the chart on my next grow to see how accurate I can keep it. Thank you for sharing.
 
Hey, old grouch.
When I run that chart using leaf surface temps, the plants are always quite happy.
I agree that some strains are more susceptible to pathogens that require really stressing the environment for the bug as well as the plants.
Just remember that as the vpd increases, so does the internal vascular pressure of the plant trying to move moisture.
 
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