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As we turn the page to another chapter in our cannabis cultivation journey, it’s time to explore one of the most crucial post-harvest stages: drying and curing. These processes define the quality, potency, and overall experience of your final product. Last week, we reflected on the dynamic relationship between cannabis and hemp, bridging our understanding of its versatility. This week, we focus on how growers can harness the art and science of drying and curing to preserve the best of what cannabis has to offer.
Drying and Curing: Understanding the Differences
Though often mentioned in tandem, drying and curing serve distinct roles in post-harvest processing:
Drying: This initial step removes excess moisture from the harvested cannabis to prevent mould and decay. Proper drying stabilizes the plant material, preparing it for long-term storage and further processing. According to recent studies, factors like temperature, humidity, and airflow significantly influence the retention of cannabinoids and terpenes during drying
Curing: Curing comes after drying and involves slow maturation of the cannabis in controlled conditions. This process enhances the chemical complexity of the cannabinoids and terpenes while improving flavour, aroma, and smoothness. It’s akin to ageing fine wine—patience is key for premium results
Key Components for Success
To master drying and curing, growers must carefully balance several critical factors. This can take many seasons to figure out and it is important to recognise that when you are just getting started being in control of all factors can be tricky. Try and get the following down.
Harvest Timing
Timing is everything. Trichome maturity dictates the peak potency and flavour profile. Harvesting too early or late can drastically affect the final quality. There are many ways to determine harvest readiness. When looking at an overall bro-science approach, growers check trichomes on flowers with a jeweller loop. Looking at the concentration of trichomes and their maturity, some want to see a ratio of 10% amber to milky trichomes when looking at a selected area on the plant.
Drying Environment
Room Size: The space in which you decide to do your post-harvesting is crucial. The room needs to be clean, dry, and dark. You also need to consider the overall space of the room compared to your harvest. Cramming too much produce in a room can cause issues, as can having too much space for not that much produce.
Temperature: Optimal ranges between 16–21°C to avoid terpene evaporation while ensuring moisture reduction. This too can be easier said than done. Most times growers select a space that they have the least control over and or is in too much direct sunlight. Your temps can be controlled by an A/C unit too, but consider what it would do to your electricity bill and if the size of the Aircon unit you can afford will work for your room.
Humidity: Keeping relative humidity (RH) at 50–60% minimises mould risk and promotes even drying. This will also ensure that your curing process is more stable and consistent. When relative humidity fluctuates too much during drying, the problems it can cause, even in ideal temperatures, cannot be ignored. It’s so important not to have drastic changes in these.
Airflow: Gentle circulation prevents moisture buildup without damaging the trichomes, the tiny structures rich in cannabinoids and terpenes. It also helps avoid mould, but if done incorrectly, it can aid in drying the cannabis too fast, which can cause flavour and effect imbalances.
Curing Process
Use airtight containers like glass jars to retain the terpene profile and cannabinoids while controlling residual moisture. This process should take time. There is no need to rush the curing process as it is the last effort required to lock in all the goodness the flower has to offer. I always say, there are a thousand ways to skin a cat. And when I look at different growers doing different drying and curing techniques it’s hard to just say this is wrong and this is best. What all growers are trying to achieve during the process is the same.
As long as you have an understanding of what it is you are trying to achieve, your methods to your madness are your own. Some people burp jars in the first few weeks to let the last moisture out of the jars and to ensure no mould can fester on the inside. This slower release of moisture in the jars aids in the curing process resulting in a smoother smoke. Other growers will say if the flower is releasing moisture then you havent dried it correctly…You decide which is which.
Considerations for Growers
Space Planning
Whether cultivating indoors, outdoors, or in a greenhouse, drying and curing requires dedicated, controlled environments. Consider modular drying racks or customized climate chambers for efficiency. Make sure you have enough space prior to growing the cannabis. Knowing what the drying and curing capacity of your space will also create less stress. There is nothing worse than not having enough space for all your cannabis. YOu will end up ruining all your cultivation efforts just due to lack of space or excitement to plant, whichever way you want to look at it.
Cultivar-Specific Approaches
Each strain or chemovar responds differently to drying conditions. Research suggests that controlled atmosphere chambers tailored to the cultivar’s chemical composition can optimize cannabinoid and terpene retention. I don’t doubt that this is a bit more advanced know-how and that not everyone will grasp this. But if you are learning from previous harvests then optimising your room from previous settings will only make your results better.
Scalability and Efficiency
Large-scale growers may benefit from integrating innovative methods like vacuum-microwave drying or controlled nitrogen environments to reduce processing time while preserving quality. On large-scale operations ,it is important that things flow consistently, and not having space is not an option, So for those that can afford this investment, it really is a game changer.
The Role of Science in cannabis drying and curing
Drying and curing cannabis is where science meets art, blending precise environmental controls with intuitive craftsmanship honed through experience. Each stage is a delicate balance of preserving the plant’s biochemical integrity while enhancing its sensory and medicinal qualities.
The Foundation of Precision
Scientific research provides invaluable insights into the optimal conditions for drying and curing cannabis. Key studies highlight how cannabinoids and terpenes—critical to the plant’s potency, flavour, and therapeutic effects—are highly sensitive to temperature, humidity, and oxygen exposure. For example:
Cannabinoid Preservation: THC and CBD degrade under excessive heat or prolonged light exposure. Scientific studies recommend temperatures between 16–21°C to stabilize these compounds during drying.
Terpene Retention: Terpenes, which are volatile organic compounds, evaporate easily if temperatures exceed 21°C or if the airflow is too strong. Controlled drying environments minimize this loss, ensuring the final product retains its distinctive aroma and effects.
Curing Chemistry: During curing, residual moisture evaporates slowly, and cannabinoids continue to mature. This process enhances the smoothness and complexity of the smoke or vapour, with studies showing that extended curing can increase the conversion of inactive cannabinoid precursors into their active forms.
Science also drives innovation. Techniques like vacuum-microwave drying and controlled-atmosphere curing chambers are emerging as tools to streamline these processes while preserving quality. These advancements ensure consistency, scalability, and efficiency—qualities essential for commercial cannabis production.
Craftsmanship: The Art of Mastery
While science provides the foundation, craftsmanship transforms cannabis drying and curing into an art form. Experienced growers develop an intuitive understanding of their plants, tailoring drying and curing methods to bring out the best in each cultivar.
Cultivar-Specific Adjustments:
Every cannabis strain has a unique chemical profile, and no two cultivars respond identically to drying and curing conditions. Skilled growers assess factors like bud density, terpene profiles, and resin production to adjust airflow, temperature, and humidity levels accordingly.
Tactile Expertise:
The ability to “read” a plant’s readiness for the next stage—whether it’s the snap of a stem during drying or the texture of buds during curing—is an invaluable skill honed through practice. This tactile approach ensures that the product is neither over-dried nor under-cured, preserving its optimal quality.
The Element of Patience:
Unlike the fast-paced nature of cultivation, curing requires patience. Master growers understand that rushing this process can compromise the flavour, potency, and overall experience. Their dedication to the craft ensures that every jar opened by a consumer delivers the intended quality. There are some growing cups that only permits flowers that has been cured for a minimum of 6 months. So just think about that.
Synergy of Science and Art
The true magic of drying and curing lies in the synergy of science and craftsmanship. While scientific principles establish the parameters for success, it is the grower’s hands-on approach and experience that ensures the process achieves its full potential.
As cannabis growers, the drying and curing stages are where your hard work truly transforms into a masterpiece. By understanding the nuances of these processes and tailoring them to your specific environment and strains, you can ensure top-tier quality in every harvest.
Next week, we’ll delve deeper into the advanced techniques and technologies reshaping the drying and curing landscape. We will talk about wet trimming and dry trimming. Things like the box dryer and even the Curidor. Until then, remember: cannabis cultivation is a blend of science, craftsmanship, and passion—just like drying and curing, it’s all about finding the perfect balance.
