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Vapor Pressure Deficit (VPD) has become one of the most discussed parameters in modern greenhouse and indoor cultivation. It provides growers with a more precise way to understand how plants interact with their environment. Specifically, how temperature and humidity, along with leaf temperature, drive transpiration. While often discussed in the context of climate control, VPD also has a direct impact on root-zone management, especially when using high-precision substrates like stone wool. In this article, we will explore the technical fundamentals of VPD, how it influences plant physiology, and most importantly, how growers can align VPD management with irrigation strategies in stone wool to achieve optimal growth and consistency.

GreenLeaf Medical started in 2017 and has grown tremendously since then, growing and selling a full range of products to the medicinal market within the USA. Samer Abilmona has been in the cannabis industry for a little over 10 years, but he has cultivated cannabis for the majority of his adult life. He has been the Executive Director of Cultivation and Operation of GreenLeaf Medical since 2019, then the company consisted of one cultivation facility, started to work on the second, had one dispensary in Maryland, and recently received a license in Virginia. Nowadays, the company is a multi-state operator, with facilities in Virginia, Pennsylvania, and Maryland. The cultivation is tailored to their market leader, smokable flowers. Other products within their range are live resin, live rosin, and distillates for vape cartridges as well as for edibles. About 6 months ago GreenLeaf Medical merged with Columbia Care, now the Cannabist Company, Samer has been managing a few additional cultivation and extraction facilities in West Virginia, two facilities in Washington DC, and a second Virginia location.