Knowledge

In modern professional horticulture, across medicinal crops such as cannabis and high-performance vegetable production, root zone management is a cornerstone of consistent quality and yield. Stone wool substrates provide an exceptionally stable and steerable root environment, but this advantage is only fully utilized when decisions are supported by reliable, well-interpreted data. Root zone sensors deliver continuous insight into water content, EC, and temperature. Used correctly, they allow growers to anticipate plant needs rather than react to stress signals. Used incorrectly, they introduce noise, false confidence, and misguided steering. The difference lies in strategy, placement, and interpretation. Remember that sensors are just another tool and should not replace traditional methods of monitoring.

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.

Stone wool is a powerful and precise substrate that enables growers to fine-tune plant development with unparalleled control. However, with this precision comes the need for accuracy at every step of the growing process. At Cultiwool, we have seen how easily small mistakes can lead to big inefficiencies or lost yields, especially in high-density, high-value crops like cannabis. Whether you are an experienced cultivator scaling operations or just starting with stone wool, here are the five most common mistakes we see, and how to avoid them.

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.

Do you know what has to be taken in account for succesful cultivation? In this knowledge article we will tell you everything you need to know from the end of the propagation stage to the vegetative and flowering stages in cannabis cultivation.

Successful cannabis propagation starts with high-quality plugs for cloning or sowing. Whether starting from seed or vegetative propagation in the form of cuttings, there is high importance to use the right and most suitable growing medium.

Similarly to other growing media, when stone wool is delivered it is dry, meaning, it contains 0% water. In comparison to other substrates, stone wool has many advantages, such as lighter weight, a great moisture holding capacity, more convenient transportation, and longer shelf-life for unused products. Therefore, when a grower plans to start the cultivation of cannabis, the first step (and a very critical one) is to initially saturate the stone wool.