Vapor Pressure Deficit (VPD) is a key environmental factor in indoor gardening, hydroponics, and greenhouse growing. It measures the difference between the amount of moisture in the air and the maximum moisture the air can hold at a given temperature.
In simple terms, VPD defines how easily plants can transpire, absorb nutrients, and regulate water loss.
Maintaining the correct VPD range helps growers:
Improve plant transpiration efficiency
Increase nutrient uptake in hydroponics
Prevent fungal diseases and mold
Optimize photosynthesis and growth rate
Achieve higher yield and better plant health
A balanced environment requires:
Proper temperature (°C/°F)
Controlled relative humidity (%)
Stable air circulation
Consistent VPD range
👉 Without proper VPD, plants may suffer from:
Slow growth
Nutrient deficiencies
Leaf curling or stress
To better understand vapor pressure deficit and indoor plant climate control, explore these detailed resources:
📊 VPD calculation sheet with temperature and humidity examples
🎞️ VPD presentation explaining plant transpiration and environment control
📁 Full VPD resource folder with all materials