VPD Calculator
Vapor Pressure Deficit (VPD) describes the difference between the current and maximum water vapor content of the air. The heatmap shows you at a glance which combination of temperature and humidity is optimal for your growth stage.
Vapor Pressure Deficit
0.91 kPa
VPD is optimal for the Vegetative phase.
Strain Recommendations
Indica strains prefer slightly higher humidity and a lower VPD value. They are more sensitive to dry conditions.
- •Maintain higher humidity than with other strains
- •Ensure good air circulation to prevent mold at high humidity
- •Slowly increase VPD during bloom phase to minimize stress
Sativa strains tolerate drier conditions and a higher VPD value. They often originate from tropical regions with strong transpiration.
- •Use tolerance for drier conditions to promote vigorous growth
- •Plan for a longer bloom phase and adjust VPD values accordingly
- •Ensure sufficient watering, as higher VPD means more transpiration
Autoflower strains have a shorter life cycle and less error tolerance. Stable environmental conditions are especially important.
- •Stable VPD values are more important than with photoperiodic strains
- •Less error tolerance — deviations affect yield more quickly
- •Account for shorter seedling phase and transition quickly to vegetative range
CBD strains are often more robust and tolerate slight fluctuations better. A slightly lower VPD can positively influence the terpene profile.
- •More robust against fluctuations than THC-dominant strains
- •Slightly lower VPD can positively influence the terpene profile
- •Consistent conditions promote a balanced cannabinoid ratio