Lesson 1, Topic 1
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Common VPD-related issues and solutions

Cartier April 13, 2023

Vapor Pressure Deficit (VPD) is crucial in understanding plant transpiration and ensuring optimal growth conditions in a controlled environment. As the difference between the vapor pressure inside and outside the leaf, VPD can greatly impact the plant’s ability to take up water and nutrients. In this article, we will explore common VPD-related issues and provide effective solutions to maintain an ideal environment for plant growth.

Inadequate VPD levels

Issue: Maintaining an optimal VPD is essential for healthy plant growth. However, inadequate VPD levels can lead to several issues, such as slow growth, nutrient deficiencies, and increased susceptibility to pests and diseases.

Solution: To maintain an ideal VPD, closely monitor temperature and humidity levels closely. Consider investing in a digital hygrometer to ensure accurate readings. Additionally, employ climate control systems like heaters, dehumidifiers, or humidifiers to regulate temperature and humidity levels according to the needs of your plants.

High VPD levels

Issue: High VPD levels can lead to rapid transpiration, causing plants to lose water faster than they can uptake it. This can result in wilting, leaf curling, and decreased nutrient uptake, ultimately affecting overall plant health and yield.

Solution: To lower VPD levels, increase the relative humidity (RH) or decrease the temperature in the growing environment. You can achieve this by misting the plants, adding a humidifier, or adjusting the temperature control settings. Be cautious not to create conditions that promote mold or disease development, and ensure proper ventilation to avoid stagnant air.

Low VPD levels

Issue: Low VPD levels can result in insufficient transpiration, causing poor nutrient uptake and slow growth. Prolonged exposure to low VPD levels can also increase the risk of mold and mildew growth due to high humidity levels.

Solution: To raise VPD levels, decrease the relative humidity or increase the temperature in the growing environment. You can accomplish this by using a dehumidifier or adjusting the temperature control settings. Additionally, ensure proper air circulation and ventilation to minimize the risk of mold and mildew growth.

Fluctuating VPD levels

Issue: Consistently fluctuating VPD levels can stress plants and negatively impact growth. This can be caused by factors such as inconsistent temperature and humidity or poor climate control systems.

Solution: To stabilize VPD levels, invest in a reliable climate control system that maintains consistent temperature and humidity. Regularly monitor and adjust the climate settings to create a stable plant environment. Maintaining proper air circulation and ventilation is also important to avoid stagnant air and potential disease issues.

Inaccurate VPD readings

Issue: Inaccurate VPD readings can lead to improper adjustments of temperature and humidity levels, ultimately causing harm to your plants. This can be due to low-quality monitoring equipment or improper sensor placement.

Solution: Invest in high-quality sensors and monitoring equipment to ensure accurate VPD readings. Place sensors at canopy level and away from direct sunlight or other heat sources to avoid inaccurate measurements. Regularly calibrate your sensors to maintain their accuracy over time.


Maintaining an ideal VPD is crucial for optimal plant growth in a controlled environment. Understanding common VPD-related issues and implementing the appropriate solutions can create a stable and healthy environment for your plants to thrive. Monitor temperature and humidity levels regularly and invest in high-quality equipment to ensure accurate readings and effective climate control.

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