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.

In controlled cultivation, every detail matters, from light intensity and nutrient balance to humidity and air circulation. But one crucial factor often overlooked is leaf temperature. While most growers closely monitor air temperature, the temperature of the leaves themselves can tell a much more accurate story about how the plant is actually responding to its environment.

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 has become the preferred substrate for precision cultivation, offering growers unparalleled control over water, nutrients, and oxygen availability at the root zone. As controlled environment agriculture (CEA) advances, one of the most impactful strategies growers can adopt is crop steering. That is a data-driven approach to adjusting environmental and nutritional inputs to guide plant development toward desired outcomes. Whether targeting higher biomass, increased yield, or enhanced quality (such as flavor or cannabinoid concentration), crop steering techniques can transform results in both medicinal and food crop production. This article explores advanced nutrient and crop steering strategies tailored to stone wool systems, providing practical insights for growers seeking to elevate their cultivation practices. Please note that throughout the article, you can find links to previous publications for more in-depth information. Keep in mind that crop steering must be monitored very closely, as all the techniques are based on optimal conditions. Once a limiting factor is determined, the grower must make adjustments accordingly.

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.

Stone wool substrate has gained popularity in horticulture due to its excellent water retention and air porosity characteristics, which are essential for healthy plant growth. However, one common issue that growers often encounter when using stone wool is channeling. Channeling refers to the inefficient distribution of water and nutrients within the substrate. In this article, we will explore what channeling is, what typically happens when it occurs, how to identify its signs, and discuss methods to prevent it. We will also delve into why some stone wool products are more prone to channeling than others and explore the role of binders and wetting agents. Finally, we will touch upon the importance of choosing the right irrigation system to avoid channeling.

Cannabis cultivation is a complex process, with many different factors affecting the growth and development of the plant. One of the most important aspects to consider to allow cannabis plants to thrive is the nutrient balance within the growing medium. Among these essential nutrients is magnesium, a mineral that plays a critical role in plant growth and development. In this article, we'll take a closer look at magnesium deficiency in cannabis cultivation. This article is the last one of the sequence written following an interview with Ryan Wankel.

“I think dry backing is probably one of the techniques that a lot of growers use to increase cannabinoids and flavonoids content” Ryan mentioned. But how does it work and what does it really mean? This article is a continuation of the previous one, following an interview with Ryan Wankel, and will focus on the cultivation manipulation known as Dry Backs.

To start successful cannabis cultivation the Starter Plugs are a must. In order to reach the best results, it is recommended to follow this easy yet important instruction guide with attention to the small details.

Previous articles have presented, among others, information regarding the importance of irrigation strategies, crop steering, measuring WC and EC in the stone wool, and more. In this article we discuss the ideal 24-hours irrigation dynamics for cannabis cultivation on stone wool.