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Climate and Humidity for Growing Marijuana

Mar 10, 2020
Humidity & ventilation

Climate and Humidity for Growing Marijuana

People become interested in growing cannabis for as many reasons as there are people growing it. Many individuals want useful and accurate information that will enable them to grow high-quality weed for personal use. Some others, non-users unfamiliar with marijuana, have invested in large, commercial grow operations in hopes of large financial returns.

Recipe Needed

It is always desirable to grow as high-quality a crop as possible, regardless of its size. Competition in the marketplace is intense and growing more so as pot explodes into the mainstream. Every grower wants to produce the best strains. Soon it will be possible to get a degree in cannabis.

Somebody new to growing may feel considerable pressure to make the right choices and as few mistakes as possible. Growing marijuana is like baking cookies. Once you have the right ‘recipe’ all there is to it is to keep using the recipe. There are weather-related variables beyond a grower’s control in an outdoor operation, but indoor growing rooms are recipe ready.

Ask the Right Questions

This begs the question: how do you create the best climate for a marijuana growing room? What does a growing room that designed produce some of the best weed on the market require? What makes marijuana plants happy? Is it true that happy cannabis plants produce the highest quality of marijuana?

To learn the answers to these and other questions, keep reading for a detailed explanation of everything you need to know to establish a successful growing room. The primary difference between a small home-grown business and a full-scale commercial operation is not much more than differences in size and scale.

Set the Stage for Reliable Results

Growers manipulate the airflow, temperature and humidity within their greenhouse environments as needed. They want to know the results they observe come from the changes they are implementing, and not from something else they were doing. Plants established in well-drained soil with a pH of 6.5-7 with ample and properly positioned light should thrive in those areas. By providing all plants with proper light and an adequate growing medium, the grower knows that any variations he observes are the result of changes in the growing environment’s temperature, humidity, and air circulation.

Grow Room Climate

As amazing as plants are, they are not sentient beings. They don’t know if they are inside or out, and they do not have opinions. Plants have responses to their environment. Their job is automatic—to grow to the degree permitted by the parameters of their environment. Temperature and humidity are the two most important variables within the grow room. Ideally, they work together to create the perfect growing environment for your plants. Temperature and humidity needs vary according to the age of the plant.

Temperature and Humidity—More Important Than You Think

Cannabis is a plant that will willingly attempt to grow in a range of circumstances. Novice growers know this, and naively assume that, as a result, there is no need to focus on grow room climate. Instead, they fuss with the soil, amending it with supplements they believe may help it perform better. While there is nothing wrong with this, they ignore the oh-so-important temperature and humidity controls that they already have and which cost nothing.

Potency Depends on Humidity

Temperature and humidity may not be visible, but do not make the mistake of ignoring them. Their invisibility doesn’t make them intangible. Plants live and die and have their being as the direct result of the interplay of heat and humidity. Cannabis plants love warmth and humidity—nearly all plants do. However, the specific goal here is to produce potent buds. Anyone with more than a casual acquaintance with growing weed can attest that careful manipulation of these factors at just the right stage in a plant’s development significantly influences its potency.

Humidity Control is Quality Control

Humidity is the percentage of moisture present in the atmosphere of a specific climate. This climate may be regional or artificially created. The Southwestern U.S. has a hot and dry climate, for example, while the Southeastern U.S. is hot and humid. Humidity is just water vapor in the air. Outside, humidity is occasionally visible as fog or clouds. Rain falls when humidity reaches the point of saturation within the present climate.

The non-fussy cannabis plant willingly grows in most places, including growing rooms not controlled for heat and moisture. Plants may grow, but without controlled heat and moisture, they are unlikely to produce a quality product. Pay attention to these two variables and watch product quality increase. Growing cannabis is all about product quality and profit. Why should you spend the effort if not for exceptional results? Every grower wants to produce high-quality bud, one that is fragrant, dense, and loaded with precious THC/CBD containing terpenes.

Growers must guard against mold developing in their budding plants. Remove excess moisture from growing room air as a safeguard against mold development. Strategic moisture reduction increases the development of highly prized trichomes or glitter. Careful control of the interplay between humidity and temperature is as important to the end product as fertilizer or water. Humidity requirements may vary slightly between sativa and indica strains.

Evaporation Strain Leads to Slower Growth

Humidity also relates to evaporation. The more humidity present in the atmosphere of a micro-climate, the slower the rate of evaporation. When too much moisture is present for evaporation to occur, plants respond by closing their pores, which usually facilitate oxygen and carbon dioxide exchange. Stomata are the plant’s growth remains inhibited as long as its stomata are closed. Too much humidity equals slow growing, stunted plant growth.

Less Humidity at the Right Time Leads to More Resinous Buds

Cannabis plants use more of the soil’s nutrients and water when the humidity in the environment is low. Humidity control is crucial to the development of sticky, moist, resinous buds. Managed humidity enhances product color, fragrance, and taste. It also increases overall bud weight. Without enough moisture in the environment, the product itself is dry.

Clients interpret dry, powdery pot as a poor product, and they are correct. Keep humidity at 40% or even lower during the last two to three weeks of flowering for resinous buds. Low humidity encourages the plant to protect its internal moisture by creating a coat of resin which it uses to seal itself. Also, know that the more time plants spend flowering, the heavier their buds.

 How to Increase and Decrease Humidity in a Home Growing Room

Each growing operation has internal climate controls. While some large-scale commercial systems are elaborate, the principles upon which they operate are the same. In simple growing rooms, when the humidity becomes too high, the grower opens a window. Add an exhaust fan and a fresh air intake and you’ve stepped up a level.

The problem may not be too much moisture. The problem, especially early on, is a lack of moisture. Add humidity into the atmosphere of a growing operation with a humidifier or vaporizer. Non-electric ways of increasing humidity include hanging up towels that have been wet and setting out pans of water. Remove moisture with a dehumidifier and/or extraction fan. Air-conditioners likewise remove moisture from the air.

Use a hygrometer to get an accurate measure of humidity present in the growing room. Start seedlings off at 70% humidity when their roots are small. Seedling and vegetative cannabis plants respond best to higher levels of humidity. Gradually reduce humidity by 5% a week. At 40% humidity, plants should be flowering.

Just as the cannabis plant requirements for moisture vary depending upon where they are in their development, so do their needs vary regarding ideal temperatures. As with humidity, temperature requires monitoring and change to achieve the desired outcome. Depending upon where in the country you have your growing room, a grower’s struggle might be to keep temperatures high enough to withstand cold outdoor temperatures. In another part of the country, another grower might continuously watch the thermometer’s upper registers.

Cold Temperatures

Cannabis plants do not grow as well when the temperatures drop. Freezing temperatures are lethal to marijuana plants. While they do not always die outright, they appear miserable. Cold cannabis plants are sulky. They wilt and struggle to grow. Cold temperatures make them unable to interact with their environment. They cannot absorb what they need from their environment in terms of soil, moisture, and sun when they are chilled.

Falling temperatures stress marijuana plants and cause their leaves to droop. Freezing temperatures may be fatal to cannabis plants. Some plants are heartier than others, but those that survive do not thrive, and their yields are less than that of similar, protected plants. It is important not to let temperatures in the growing environment fall below the 60° mark at night to prevent plants from experiencing a shock.

Cool plants are more vulnerable to developing mold and mildews. These contagions spread rapidly, and it is urgent to contain outbreaks to avoid the loss of an entire crop. Avoid moldy plants like the plague. Discard molded plants immediately. There is no way to remove mold from marijuana bulbs, and who wants to smoke a fungus? Passing moldy pot on to your clients is a sure way to eliminate your client base.

Growers must control humidity, temperatures, and airflow for a healthy crop. Consistent warmth and a continuous flow of moving air in the growing environment, along with humidity controls prevent mold from developing. Increase the chances of harvesting a bumper crop of top-shelf weed by keeping a close eye on these three variables. It is easy to keep plants satisfied, healthy, and growing when you understand what they need and consistently provide it for them. From seed to smoke, the more you nuture your plants, the more amazing the product will be.

Hot Temperatures

Do not regard all discussions about upper register temperatures in cannabis grow rooms as talking about the same thing until you’ve determined whether the grower uses CO2 in his growing operation. Carbon dioxide is to plants what oxygen is to people. All other factors the same, growers using compressed CO2 will achieve higher yields providing that they also have sufficient light. Their plants can likewise survive higher temperatures than plants without added CO2. Flowering plants grown without CO2 require protection from temperatures above 80° if they are to maintain compact bud structure.

No matter where in its growth cycle a cannabis crop might be, and whether it is in an indoor room for growing marijuana or outside in a field, it requires more water when temperatures are high, particularly if the humidity is low. Soil gets dry when the air gets dry and plants suffer from dry soil and dry air alike. Cupped leaves are the first sign that a plant is experiencing heat distress. Once temperatures drop the leaves resume their normal shape.

Other Temperature Considerations

Cannabis buds are some of the most beautiful creations on earth, worth growing for table décor if not for any other reason. Who hasn’t stood at the dispensary, gazing in utter amazement at the beauty of a glorious bud, mesmerized by its pistols, its frosty trichomes, and delectable sugar leaves? Add to these a touch of pink, purple, and blue, depending upon the strain, and you have the perfect bud of marijuana.

Not all cannabis plants have the genetics for colored buds, but those that do are stunning. Cannabis color genetics require cooler night temperatures to aid in their development. Discover hidden depths of color in colored cannabis plants by lowering the temperatures a few degrees at night.

There is more marijuana in America right now than at any other point of time in history. Yet, we have barely scratched the surface of its use in America. The dam has broken, and the flood is in full progress. It shows no sign of stopping as people continue to step up, partake, enjoy, and share all the ways marijuana benefits them in their daily lives.

Research shows that cannabis may be an outstanding tool to help many people trapped in the opioid epidemic of addiction get free, permanently. New uses for marijuana as relates to addiction will be in the news for decades.

Finally, the best advice is no doubt the advice you heard growing up as a child from someone who cared about you. “If you will do something, do it right.” It is an adage that applies to marijuana as much as it does anything else. Do a good job, and the rewards are sure to be high.

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