Updated at: 24-10-2022 - By: Sienna Lewis

In order to grow cannabis indoors, you need to know the appropriate temperature for a greenhouse of 70 to 80 degrees Fahrenheit. However, keep in mind that state restrictions on cannabis cultivation vary, so be sure to check them before starting any plants. Even if you live in one of the legal states that allow marijuana growth, make sure you familiarize yourself with the state’s additional rules and regulations first.

When cultivating cannabis in a greenhouse, environmental management is critical. Your plants’ survival, like that of all indoor plants, is strongly influenced by your ability to maintain appropriate temperatures. You may get a sense of whether your region can support the growth of the cannabis plants by looking at their USDA hardiness range of 8 to 11.

Knowing What Is The Ideal Temperature For Growing Cannabis In A Greenhouse

Consider that historically, cannabis plants were grown in warm, dry climates to get a sense of the appropriate temperature. Your state’s average temperatures will make it difficult for the plants to thrive. According to Handbook of Energy Crops, cannabis is a highly adaptable plant that is ideal for growing in greenhouses.

Cannabis plants thrive in the following air and soil temperatures.

The best temperature for growing cannabis in a greenhouse and how to maintain it

In a greenhouse, 70°F to 80°F is the ideal temperature range for producing marijuana. As a result, it’s preferable to start your cannabis seeds indoors in the greenhouse as early as possible in the spring. Low temperatures will help the seeds germinate, but don’t let them fall below 33.8°F or they won’t sprout.

What Is The Ideal Temperature For Growing Cannabis In A Greenhouse - Krostrade

There should be no extremes of temperature in the greenhouse. Having a greenhouse means that your cannabis is protected from frigid temperatures because of the natural heat. Even though your location is frigid, you may always install a heating system in order to keep warm.

You can reduce heat accumulation by using ventilation and cooling systems, especially if you live in an area that has hard winters. Some growers additionally propose employing CO2 injection and illumination in order to control the temperature of the air in their greenhouses. However, how hot should the soil be in order to successfully produce cannabis in a climate-controlled environment?

Plants need a temperature of 72 to 75 degrees Fahrenheit to thrive in fertile, loamy soil. Cannabis, on the other hand, does not thrive in sandy or acidic soil. When selecting types, keep in mind their intended use, like fiber, edible seed or oil.

Is humidity control important for growing cannabis in a greenhouse?

Is humidity important for growing cannabis now that you know the ideal temps for air and soil? The success of your cultivation is dependent on managing the humidity, as you may assume. The ability to better regulate the environment in a greenhouse is something you’ve already mastered.

Seedlings and immature cannabis plants prefer a moisture content of 60 to 70 percent. During week nine, when your plants have bloomed, you can lower the humidity to 40%. Because of the heat, mold, and other diseases, a lack of humidity monitoring in the greenhouse can be dangerous.

Then, how can you regulate the humidity levels in a cannabis greenhouse, then? The best way to maintain the ideal indoor humidity level is by the use of vents, dehumidifiers, or automatic controls. As a result, certain systems can automatically vent or dehumidify based on the moisture levels.

Other Considerations For Growing Cannabis In A Greenhouse

Additionally, you’ll want to take into account lighting, blackout systems and fans, as well as activated charcoal filtration systems, to deal with potential odors and other constraints in the indoor environment. Regardless of the plants you’re cultivating, you’ll want to make sure the greenhouse has enough space. If you want the best possible circumstances, consider a greenhouse location that is facing west or south.

Why Use A Greenhouse For Cannabis?

There are many advantages to cultivating marijuana inside, such as a more consistent environment and the potential for theft. A greenhouse ensures that the conditions necessary for the plants to flourish to their full potential are always the same. Intruders will be kept out as well, thanks to its secure construction.

Furthermore, the ability to alter the climate will allow you to lengthen different stages of the cannabis life cycle. Even if you plant sooner or harvest later in the year, you will still be able to reap multiple harvests. Greenhouse horticulture offers numerous advantages for those who do their planning and upkeep correctly.

How to Select the Right Cannabis Cultivation Method for Your Greenhouse


Grow plants without soil with hydroponics. A plant’s roots are fed with an oxygenated and nutrient-dense fluid by growers. It is possible to transfer the plant’s energy normally spent on root growth into the development of the plant’s upper portion, which results in larger plants and greater yields. When it comes to nutrient management, hydroponics allows growers complete control as water-soluble salts are used as fertilizer. To the tenth of a percent, growers may precisely manage the amount of nutrients each plant receives.

As a sponge, a hydroponic substrate holds water and nutrients and slowly releases them as needed to the plant. When a plant is supporting the weight of its own blossoms, it uses this structure to anchor the roots. Some of the most common hydroponic growing media is made of rockwool and peat moss; others include vermiculite, perlite, and expanded clay. These can be combined, or they can be used on their own. Rice hulls, wood chips, and coconut shell fiber are among the increasingly popular hydroponic substrates. It’s possible to get them cheaply and in large quantities depending on where you live.

The most advanced hydroponics technologies don’t use any kind of substrate. All day long, the roots of the plants are submerged in an oxygenated nutritional solution in deep water and nutrient film systems (DWC and NFT). The roots of the plants are treated with a fine nutrition mist in aeroponics. Faster crop cycles and higher crop yields are possible thanks to these technologies, which also minimize the risk of soil-borne infections because there is no soil.

However, growing hydroponically without a substrate is the most risky method. Root rot can occur if the fertilizer solution temperature and oxygen levels are not precisely controlled by the cultivators. Because the nutritional solution is recirculated, if one plant is infected, the illness will spread to all other plants. In addition, this way of growth leaves very little possibility for mishaps. The root system of a plant can be exposed to dry air and heat if one of these systems, which include hundreds of valves, pumps, and tubes, fails. If the sun is out or the grow lights are on, a crop can be lost in a matter of hours under this situation.

Growing cannabis indoors produces a lot of greenhouse gases – just how much depends on where it's grown


Composts derived from plants or animal waste are used in organic farming. Living bacteria in organic soils progressively break down soil components, releasing nutrients for the plant. Anecdotal reports suggest that organic cannabis has a more varied terpene profile than hydroponically cultivated cannabis, which means that it smells and tastes better. However, scientific proof to support this claim is missing.

As a result, retail prices for organically cultivated cannabis flower are higher.

It’s not easy to start a commercial cannabis production business from scratch. The first step is to ensure that the raw materials for the soil and compost are consistently procured. Scaling up a horticulture business is all about doing the same thing over and over again at a massive scale. It will be tough to maintain a consistent operation if the sources of your compost and soil are seasonal or could run out. Since the planter cannot measure out 100 ppm of nitrogen, mix it with water, and apply it to their plants, nutrient management might be challenging as well. Compost or compost tea is made and then applied to the soil. This technique makes it more difficult to predict when and how much of a nutrient a crop will have access to.

Organically grown plants take longer to mature, yield less, and need more time and effort than hydroponically grown plants. Cannabis cultivators are unable to obtain organic certification at the federal level at the present time. Anyone can claim that their cannabis is cultivated organically at the moment, though this may change in the future. Exporters of medicinal cannabis should consider whether or not it is possible to designate their product as organic if they hope to sell it in other countries. The last time you went to the drugstore to buy medicine, was it branded organic? Prepare to tolerate lower yields, slower growth rates, and a higher production cost that you may not be able to recover on the day of sale in the event that this is not an option for you.

Hybrid Cultivation

The employment of a hybrid farming strategy is widespread in big outdoor or greenhouse operations when the goal is bulk production at a low cost. Hydroponically fed plants are grown on soil supplemented with organic matter, but they are fed with nutrients that dissolve in water. Soil health and plant nutrient requirements may be better controlled this manner, resulting in a better yield for the grower. Hybrid farming’s biggest drawback is the potential for soil-borne diseases to infest the growing beds. Damaged insects and mold spores can hide and remain dormant for months in the soil. Chemical fumigation of a soil bed is possible, although it is normally forbidden in the production of medicinal cannabis due to the health risks.

There should be a trade-off between intricacy and profitability when choosing the ideal cannabis production technique for your business. Grow hydroponically indoors or in a greenhouse if you’re selling whole flower to a dispensary. Take a hybrid strategy outside if you’re growing at a huge scale for biomass harvest. Try organics if you want to produce high-quality, live flower concentrates.

In any case, prepare ahead, employ the best possible grower that you can afford, and go for it!

How to Build a Greenhouse for Cannabis Production

Plan for Expansion From the Start

If you’re already successful at growing crops in a greenhouse, concentrating your cannabis business efforts on this aspect should be a piece of cake. A mistake you’ll make is failing to see this as a brand-new business with its own set of clients and routes of distribution. Start with a small cannabis greenhouse to meet immediate consumer needs, but plan to expand it as your business grows. We design greenhouses for multi-stage expansion plans for growers all over the world. Months of headaches and significant money can be avoided with a little extra effort at the start.

Balance Production Efficiencies

Growers of marijuana have a lot of experience growing their crops in limited settings. Comparing traditional indoor growth with greenhouse structures and contemporary horticultural growing technologies, there are huge productivity advantages. There is a trade-off between increased productivity and increased crop disease or pest risk when broad zones of production are used. When you consider the financial value of your marijuana crop and the possible medical necessity of giving constant treatment to your patients, there is a logical balance between production zones and isolation segmenting.

Zone segmentation can be easily performed with gable and sidewall walls and a well-designed greenhouse heating and cooling system. Growers can regulate the use of blackout curtains, irrigation and fertigation systems all from one central location in greenhouses, which are built by industry professionals.

Building the Ideal Environment

Where you are located in relation to the rest of the world. The significance of this point cannot be overstated. In certain cases, greenhouse makers and cannabis growers are not familiar with different regions of the world. People in Colorado will try to sell you a greenhouse that has worked well for them, but if you live in an area like Southern California, Puerto Rico, or Alaska, you’ll need something quite different.

Depending on the weather conditions outside, the type of equipment and the structure that is optimal for you and your crop will be determined.

The temperature of the greenhouse itself. At various phases of development, cannabis, like many other crops, prefers a variety of temperatures. As a general rule, you want your greenhouse to be between 65 and 85 degrees Fahrenheit. Your greenhouse heating and cooling systems must take into account the temperature and control requirements of each zone. However, as you’ll learn in the sections following, cannabis normally only requires 18 or 12 hours of light per day, meaning that even in the coldest nighttime temperatures, you won’t need to turn on any lights at all.

Keeping a cannabis greenhouse at a comfortable temperature and humidity levels. Humidity affects plants, as we are all aware. Too much or too little watering can lead to disease, while too little might stunt the plant’s growth. When creating a greenhouse, it is crucial to determine the humidity level at which the plant flourishes. In the vegetative stage, cannabis loves a higher humidity, while in the flowering stage, it prefers a lower humidity. You can get support from greenhouse manufacturers who are aware of this in order to develop greenhouses that are more adaptable. There are a variety of dehumidifiers on the market, and greenhouses can be equipped with misting systems if more humidity is required.

Temperature and humidity requirements influence greenhouse ventilation guidelines. There are two primary types of ventilation in greenhouses: natural and mechanical. For forced air ventilation, exhaust fans and cooling pads are sometimes necessary in addition to natural ventilation methods like roof vents and sidewall vents. Please keep in mind that cooling pads aren’t the best choice for areas with a lot of humidity.

Most greenhouse farmers utilize airflow fans within the greenhouse to circulate the air and keep healthy plants healthy in addition to ventilation to remove hot air from inside the greenhouse. You can get a greenhouse plan layout from greenhouse manufacturers that shows where the fans should be placed to maximize airflow.

Increased yields can be achieved in a cannabis greenhouse by adjusting the lighting intensity. One of the most significant advantages of greenhouse growing over indoor growing is that greenhouse plants are exposed to natural sunshine. Aside from being free, sunlight is the best way for plants to get the nutrition they need to thrive. Having said that, cannabis grows best when exposed to light for an average of 18 hours a day while in its vegetative condition. As a result, we recommend that greenhouse gardeners incorporate additional lighting into their cannabis greenhouse plans. Optimizing yields means making sure your greenhouse lighting plans accommodate year-round production.

Cannabis flowering requires a complete blackout. Longer periods of darkness are preferred for flowering over shorter ones during the vegetative stage. In order to compel your marijuana plants to flower in accordance with your production schedule, you must ensure that your greenhouse is completely dark for 12 hours every day. Using blackout curtain technology, or light deprivation in the marijuana market, is the best way to do this. The use of blackout has been prevalent in greenhouses for decades for the production of poinsettias, kalanchoes, mums, and other ornamental plants.

On gutter-connected greenhouses, blackout curtains can be used to cover flat roof regions that span from truss to truss. On freestanding greenhouses, they can be inclined to follow the roof line. Light traps for exhaust fans are available from GGS in addition to covering sidewalls and door openings.

With the addition of CO2, cannabis plants thrive. CO2 can be removed from the boiler if you have a hot water heating system. The use of liquid CO2 may be necessary in some instances. Experts in greenhouse heating, such as those at our sister company Niagrow Systems, are the best people to consult on this.

Connecting your greenhouse to a warehouse or office for packaging, shipping, and other support tasks should also be taken into consideration. For cannabis, there are a number of specific requirements, such as drying rooms and vaults, that you won’t have experienced in the conventional horticulture crops. Engage the services of a business that has the knowledge and experience necessary to assist you.

3 Main Benefits of Growing Cannabis in a Greenhouse

Take advantage of natural light

Growers no longer have to be constrained by the weather when using a greenhouse, which combines the tight control of an enclosed facility with the advantages of natural sunshine. Even in the most frigid climates, producers can reap repeated, high-quality harvests thanks to the correct climate-specific technology. It is possible to automate your greenhouse so that your crops can take advantage of the best outdoor conditions as they arise, allowing you to grow your product exactly how you want it.

Lower operating costs

When it comes to operating costs, greenhouse farming is substantially less expensive than operating an indoor business. A greenhouse facility can be more expensive to start up than an indoor facility, but farmers can quickly recoup those costs in a greenhouse setting, sometimes even within a year. The constant operation of heating, lighting, and cooling equipment is not necessary in greenhouses because of the abundance of natural light and ventilation. In the winter, the extra heat provided by a greenhouse’s additional lighting helps to keep energy expenses down. When crops need total darkness, blackout curtains can be easily erected in the greenhouse.

5 Top Tips For Growing Autoflowering Cannabis Strains in a Greenhouse | Fast Buds

Grow your business when you’re ready

It’s critical to think ahead while creating a cannabis cultivation facility, and a greenhouse makes it much simpler to do so. Any crop can benefit from GGS Gutter Connected Poly Greenhouses, and cannabis is no exception. For large-scale producers, they are the most cost-effective greenhouse solution. In addition to the gutter vents and other natural ventilation options, the single-piece arch is folded into a gothic peak for enhanced condensation control.

It has been more than 40 years since GGS has been building greenhouses that are built to last. The health of your plants is our top priority, and we’ll work with you every step of the way to make sure you have the greenhouse of your dreams.

Are you ready to get started on your commercial greenhouse? GGS’s expanding team of professionals is waiting for your call.


If you’ve looked into the regulations in your state, you might be interested in starting a cannabis farm. When it comes to cultivating cannabis in a greenhouse, do you know what temperature is best? When your cannabis plants have flowered, make sure to keep the temperature and humidity in your home under control around 70 to 80°F and 40 percent.

Before starting a cannabis garden, it’s a good idea to determine your hardiness zone and look at a variety of other factors. It’s also important to note that each state has its own set of laws, which is the first thing you should look into. Later, a greenhouse’s advantages can be used to tweak the circumstances so that cannabis plants thrive.