Tag: cannabis

Advanced Tips

Preparing Stock Solution
When feeding cannabis crops in hydroponic systems, growers must first prepare a stock tank solution—either using a complete fertilizer line from a reputable manufacturer or by mixing and matching fertilizers themselves. With a complete fertilizer line, creating a stock solution is straightforward: simply follow the manufacturer’s instructions. But for those who prefer to mix their own fertilizers, the process is more complex. Growers must understand the nutrient concentrations in each fertilizer, how much they want to feed and the dilution …
Advanced Tips

Flushing in Cannabis Cultivation
Flushing is the practice of halting fertilization before harvest and irrigating plants with plain water instead. The goal is to remove excess salts from the growing medium and the plant.[1] Growers typically flush for two reasons: First, nutrient deprivation is believed to trigger secondary metabolite production as a stress response, indirectly increasing the quality (i.e., color, fragrance, flavor and potency) of the end product. Second, reducing the plant’s nutrient content may degrade chlorophyll, which some believe contributes to the harshness or …
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Cannabis Plant Morphology
Plant morphology refers both to the scientific study of the external physical structure and appearance of plants and to the descriptive terminology used to characterize these traits.[1] In this blog post, we’ll provide an overview of the descriptive morphology of Cannabis sativa. Morphology matters The morphology of cannabis varies throughout its life cycle in relation to such factors as genetics or strain, environmental conditions and growing techniques. Its height impacts how much light it can receive, as well as its biomass and …
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Bridging Yield Gaps in Cannabis Cultivation
In agriculture, a yield gap refers to the difference between a crop’s maximum yield potential and the yield the farmer actually achieves.[1] For cannabis, the yield gap is the difference between the highest possible flower yields and those currently achieved by commercial growers under optimal conditions. Data from 2018 collected from commercial cannabis growers in Canada found projected yields ranged from as low as 3.36 grams of dry flower per square meter to as high as 3,590 grams.[2] While there is …
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Managing VPD for Cannabis
The vapor pressure deficit (VPD) is the difference between the moisture currently in the air and the maximum moisture it can hold when saturated. As we discussed in our previous blog post, VPD is an important parameter to measure and control because it directly influences plant transpiration. In this blog post, we’ll explain how to determine the VPD of the grow room using temperature and humidity, the ideal VPD levels for cannabis and the equipment needed to monitor and adjust VPD. Measuring …
Advanced Tips

Cannabis Pests and Pathogens
Pests and pathogens threaten cannabis crops. Pests—larger organisms[1] like insects and mites—physically damage plants, whereas pathogens are microorganisms that infect and cause diseases within plants. A useful rule of thumb might be that while pests can typically be removed physically, pathogens cannot. Both pests and pathogens pose distinct threats to plant health, reducing cannabis yield and quality. This blog post explores some of the most common pests and pathogens that cannabis growers may encounter, the specific plant sites they target, and …
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