Growlink Smart Farm Blog

What Is Vapor Pressure Deficit & Why You Should Monitor It

Vapor pressure deficit (VPD) and its function in plant growth can be used as a tool for increasing your harvest. VPD isn't new, but historically farmers relied on the natural climate. Only more recently, with the rising popularity of indoor commercial farming and greenhouses, it's become possible to precisely control environmental conditions, including VPD. With the best genetics and nutrients globally, your plants can't reach their potential without dialing in humidity and temperature. Knowledgeable cultivars manipulate VPD to encourage the stomata on their plants to open, allowing them to take up as many nutrients as possible, resulting in increased growth.

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Managing Greenhouse Humidity

The simple result of an enclosed growing space combined with focused sunlight is an ideal growing space. Humidity, however, can often be an enemy in such situations. Condensation is a common by-product in greenhouses as plants release moisture back into the air— especially when cold temperatures batter the greenhouse exterior. Humidity in a greenhouse is necessary, but controlling it is crucial to preventing plant stress and negative side-effects like fungus, mold, or mildew. 

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