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Vapor Pressure Deficit (VPD) and Environmental Control

Cartier April 13, 2023

Vapor Pressure Deficit (VPD) is a crucial factor in indoor cannabis cultivation that directly affects plant growth, transpiration rates, and nutrient uptake. VPD is the difference between the amount of moisture in the air and the maximum amount of moisture the air can hold at a specific temperature. It is an indicator of the balance between humidity and temperature in your grow environment, helping growers create optimal conditions for their cannabis plants.

Proper environmental control is essential for maintaining ideal VPD levels. By carefully managing humidity, temperature, and airflow in your grow room, you can achieve the optimal VPD range for each growth stage of your cannabis plants, generally between 0.8 and 1.2 kPa for the vegetative stage and 1.2 and 1.6 kPa for the flowering stage.

Maintaining the right VPD levels contributes to healthy cannabis growth, improved nutrient uptake, and increased resistance to pests and diseases. By understanding and controlling VPD, indoor cannabis growers can optimize their grow environment and ultimately enhance their plants’ overall health, yield, and quality.