However, even if you’re using CO2, most growers recommend you back off and bring the temps down to 65-80°F for the last two weeks before harvest. Night temperatures should be kept around 68-75°F (20°-24°C) for most strains. Too-cool temps increase the chances of bud rot, which thrives in the 60°F (15°C) range, and freezing temperatures can actually damage or even kill your plants. However, if you’re growing a strain that turns color, keep in mind that some of these strains will only show their color when night temperatures are at least a few degrees cooler than during the day in the flowering stage. Some strains need slightly cooler night temperatures before their buds will turn colors.
For example the buds of this Auto Frisian Dew turned bright purple after it started getting below 70°F (21°C) temperatures at night. Humidity stumps a lot of new growers and causes several unexpected problems. Maintaining higher humidity during the vegetative stage will reduce salt levels within the plant while encouraging healthy and lush growth. During the vegetative stage , if humidity drops below 40%, especially anywhere below 25%, it can cause problems that look like nutrient deficiencies or light/heat stress! But in these cases, just adding a little moisture to the air does wonders, even if you don’t change anything else. During the flowering stage , your cannabis plants actually prefers less humidity! Decreasing moisture in the air (lowering the humidity) during the flowering stage helps prevent mold and actually may increase trichome production in your buds! For best results, keep humidity 40%-50% during the flowering stage. Lower humidity levels in the flowering stage helps promote trichome production, which increases the amount of “glitter” you see on buds.
“But I’ve never worried about humidity and my plants are fine…” The truth is, you can successfully grow your marijuana plants in high or low humidity, even if growth isn’t perfect. This is the primary reason why many growers – especially new ones – forget about humidity altogether. New growers also tend to hastily spend money on CO2, supplements or expensive nutrients when controlling the humidity in their setup could make a much bigger difference in their final product. So if you’ve realized that your humidity is far higher or lower than what’s recommended, you may be able to make a simple, relatively cheap change to dramatically improve the vibrancy of your plants. For growers in really dry or humid areas, it can make a big difference to buy a humidifier/dehumidifier and make sure they’re always providing the optimum humidity levels. And there’s one more insider trick you need to know about humidity: So you know you need to keep humidity in 40-50%RH range for the flowering stage, but there is one extra trick… Use a dehumidifier to drop the humidity down as low as you possibly can for the last 2-3 weeks of flowering (I’ve gotten the humidity as low as 25%). This extreme dryness will encourage the buds to seal and protect themselves with additional resin (in other words, a sparkling outer layer of THC-heavy trichomes). As an added bonus, this trick also gets your buds prepped for a successful, mold-free drying process because your buds have already given up some of their moisture. 6.) Make Sure Grow Room has Strong Air Flow & Good Ventilation. This is yet another factor having to do with air quality (we already listed temperature and humidity). Over time, any grower (especially indoor growers) will see that great air quality is a big contributor to star-quality buds. Air flow and ventilation are essential if you want to create perfect air quality. For 1-3 plants smaller to mid-sized plants, you’ll probably be fine with an oscillating fan or two. With a big grow and hot lights, you’ll need a better exhaust system to ensure proper airflow, but it can be easy to set up! 7.) Master the Basics – Especially Drying & Curing. You probably know that in order to get the best results, your plants need to make it through the majority of their lifecycle without major problems. But although your growing methods are incredibly important, one of the most important things to focus on is when you harvest, as well as the process of drying/curing your buds after harvest. In fact, the things you do during and after harvest, including drying/curing, makes up almost 50% of your final bud appearance! Drying/curing the right way will make buds smell better, look better, be more dense, and buds will actually feel more potent ! If you haven’t really been paying attention during the drying/curing part of your grow, you should focus here for the greatest gains in quality! Drying buds slowly and then curing them in glass mason jars for 2-4+ weeks helps “tighten up” buds so they are more dense. Curing also intensifies smell and increases potency! A lot of mistakes that won’t kill your plant (like nutrient burn, nutrient deficiencies, and heat stress) can often still damage the overall appearance of your buds, especially big problems that happen after the beginning of the flowering stage while buds are in the process of forming. More importantly, too many problems during the flowering stage can reduce the maximum potency your plant can achieve! So in order to get the best yields along with beautiful buds that sparkle in the light, you need to gain a complete understanding of the basics of growing. It’s also important to provide your plants with a good growing environment. But if you were to focus on just ONE thing to improve with your grow, the factor that makes the biggest difference to your quality (besides the strain) is the drying and curing process.
To Sum it Up: Learn everything you can, start with good genetics and create the perfect growing environment to produce the best buds! Increasing Cannabis Potency During the Growing Process. When it comes to growing cannabis, there are lots of different goals by different growers. Many growers are growing medical marijuana for medical-related purposes. For many growers, including both medical marijuana and recreational cannabis growers, a common goal is to maximize the amount of THC and other cannabinoids produced when growing cannabis (ie increase the “potency” of your buds). This cannabis bud was grown to produce the highest levels of THC possible – as a side effect it is dense, sticky and looks great. Greater mental and psychoactive effects from the same amount of bud (your harvest will go further!) Many medical marijuana growers desire high THC levels for the relief of nausea, certain types of pain, spasticity, certain symptoms of multiple sclerosis, etc. Many of the things you do to increase THC levels will also increase your overall cannabis yields. However, not every grower wants the highest levels of THC in their bud, and may actually be seeking other cannabinoids found in certain strains.
For example, there are many medical marijuana growers who prefer low -THC, high-CBD cannabis, which is non-psychoactive and may be of interest to those looking for possible relief from anxiety or seizures. Learn more about the difference between CBD and other cannabinoids like THC (unfortunately you can’t use grow methods to increase CBD levels, you need to start with a low-THC, high-CBD strain).