What Is The Ideal Temperature For Growing Cannabis In A Greenhouse

If you don’t know what the ideal temperature for growing cannabis in a greenhouse that is 70 to 80°F, cultivating cannabis indoors is will be impossible. At the same time, remember that cultivation laws for cannabis are different for every state, and it’s essential to check them before growing the plants. Alaska, Colorado, Washington, Maine, Massachusetts, Michigan, Nevada, and Oregon are states that allow cultivation, but still, read the additional guidelines for each. 

Environmental control is a significant consideration when growing cannabis in a greenhouse. Like all plants you grow indoors, your plants’ survival is significantly affected by how well you can maintain optimal temperatures. Simultaneously, the cannabis plants are USDA hardiness 8 to 11, which can also give you a gist if your location will support their growth or more modifications in the greenhouse. 

What Is The Ideal Temperature For Growing Cannabis In A Greenhouse

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

To know the ideal temperature, take into consideration that cannabis plants formerly come from warm and dry locations. Therefore, the plants will have a hard time surviving if your state experiences harsh average temperatures. However, the Handbook of Energy Crops has also stated that cannabis is incredibly adaptable, making it an excellent greenhouse crop.

Below are the best air and soil temperatures for cannabis plants.


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

The best temperature for growing cannabis in a greenhouse is at 70 to 80°F. Because of this, it’s best to sow your cannabis seeds in early spring in the greenhouse. The seeds will germinate at low temperatures, but be careful not to reach below 33.8°F since this condition will prevent germination. 

Overall, the greenhouse should not be extremely hot nor cold. Since you’re growing in a greenhouse, you also benefit from protecting cannabis from freezing weather due to the natural heat. However, you can always add a heating system if your location is freezing.  

As for controlling heat, you can practice ventilation and cooling systems to prevent buildup, especially if you experience harsh months. Some growers also recommend using CO2 injection and lighting to have more control in air temperatures. But what about the soil temperature for growing cannabis in a greenhouse?

Maintain 72 to 75°F on fertile, loamy soil to support your plants thoroughly. On the contrary, sandy and acidic soil will not work best for cannabis. And lastly, don’t forget to pick the appropriate varieties according to their intended usage like fiber, edible seed, and oil.


Is humidity control important for growing cannabis in a greenhouse?

Now that you know the optimal temperatures for air and soil in your greenhouse, is humidity important for growing cannabis? As you can expect, controlling the humidity also plays a role in the success of your cultivation. You already have a headstart in using a greenhouse to control the environment much more comfortably.

Aim to start seedlings and young cannabis plants at 60 to 70% because they prefer moisture. As they grow, you can reduce the humidity at 40%, especially during week nine, when your plants have flowered. Failure to check the humidity in the greenhouse can be detrimental because of the heat, mold, and other diseases.

So how can you control the humidity levels in the cannabis greenhouse? Vents, dehumidifiers, or automatic controls are the best solution for ensuring the optimal humidity level indoors. The latter would save you the trouble because some systems can automatically vent or dehumidify depending on the moisture levels.


Other Considerations For Growing Cannabis In A Greenhouse

Besides temperature and humidity, you want to consider lights, blackout systems, fans, and active carbon filters to address potential unwanted odors and other indoor limitations. You also want to ensure adequate space inside the greenhouse as you would, regardless of the plants you’re growing. Lastly, choose a greenhouse location facing west or south to provide excellent conditions. 


Why Use A Greenhouse For Cannabis?

For starters, growing cannabis in a greenhouse already protects your plants from the inconsistencies of outdoor conditions, and maybe even theft. A greenhouse ensures stable and consistent requirements for the optimal growth of the plants. And because of its enclosed design, you can keep off burglars. 

More importantly, the control you have on the climate will allow you to extend phases in the cannabis life cycle. You can even harvest much later or plant earlier to get several harvests in a year. With proper planning and maintenance, you can reap multiple benefits with greenhouse cultivation. 



Perhaps you’ve checked your state’s laws, and growing cannabis is something you want to pursue. You already have the greenhouse ready, but do you know what is the ideal temperature for growing cannabis in a greenhouse? Temperature and humidity control are crucial for the survival of cannabis plants, so always maintain the indoor conditions at 70 to 80°F and 40% humidity level when your plants have flowered. 

Overall, check your hardiness zone and study other considerations before cultivating cannabis. It’s also worth emphasizing that there are different laws for each state, which is the first factor that you must look into. Afterward, you can always use the advantage of a greenhouse in modifying the conditions that are suitable for cannabis plants. 


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How To Prevent Root Rot In Hydroponics: 3 Useful Tips

If you’re a newbie gardener who’s looking to find ways to hone your skills, you’d want to learn how to prevent root rot in hydroponics even before this problem affects your plants.

Hydroponics can be advantageous to crops in more ways than one. However, it also comes with risks of diseases, such as root rot, which can be destructive or even lethal to your plants.

Unfortunately, there are no effective methods to recover the wilted parts that were affected by the root rot once it hits your plants. The only thing you can do if you do not want this catastrophe to befall your crops is to prevent it before it happens. Read on to learn more about this subject.


What is Root Rot?

Root rot is a disease that attacks the plant roots and causes them to suffer decay. This usually happens when a lack of oxygen supply occurs in the substrate.

To give you an idea, think about plant roots that are submerged in water that only has a little oxygen in it. Over time, the plant suffocates and dies.

Aside from rot and decay, this disease also leads to the proliferation of fungi that are naturally present in the soil. These include Rhizoctonia, Alternaria, Pythium, Botrytis, Fusarium, or Phytophthora. As soon as fungi colonies start to grow, they tend to target the weakened roots and infect your precious plant babies.

Once the plant becomes infected, they won’t be able to take in what they need to grow – water, oxygen, and other nutrients. When this happens, it won’t be long before the plant dies.


What is Hydroponics?

In case you’re not aware, the term hydroponic is derived from a Latin word that means “working water”. To put it simply, hydroponics is an art that involves growing various types of plants without soil. If you’re like most people, the first thing that comes to mind when somebody talks about hydroponics would be a picture of plants with roots suspended into the water without using any type of growing medium.


Avoiding Root Rot in Hydroponic Systems

Detecting and identifying root rot can be tricky. When your plants get infected, their leaves and roots gradually wither until the whole crop itself dies from the lack of nutrients, which is a common symptom of many diseases.


What causes root rot in hydroponics?

One of the requirements in hydroponics systems is oxygen. Without it, your plants are basically on the road to death. On the other hand, lack of such is one of the major triggers for root rot, and it must be avoided at all costs.

Just like when planting in soil, you loosen up the ground so that your plants’ roots can have their required intake of oxygen. That is the case for crops grown in aqueous solutions as well. If they cannot breathe, they would not be able to grow.

Another agent for root rot is the temperature. The last thing you would want in your system are parasites that leech nutrients intended for your plants and infect the water during the process. In common terms, these fungi are called molds.

One of the best breeding grounds for these is warm and moist areas. For this reason, if the water temperature inside your reservoir is high, then you are susceptible to it. Something as minor as letting the solutions exposed to sunlight can already be a risk factor.


3 Useful Tips on How to prevent root rot in hydroponics

There is good news! Root rot in hydroponics can be prevented! Just follow these tips:

Tip#1: Use the right air pump

If you do not want root rot to affect your plants, you merely have to avoid its causes. If you need oxygen, keep the water bubbling by providing an air pump of appropriate size, and also give importance to proper ventilation in the room.


Tip #2: Maintain the temperature

The temperature should be maintained within the 70 to 80 degrees F range. Get rid of any materials that can make your system vulnerable to infections, and make sure not to disturb your crops while they are trying to grow.


Tip #3: Get rid of the rotten parts

However, if you failed in preventing the disease, then the rotten parts should be removed immediately. Cut them off as there is no chance of reviving them, and focus on the potential new growth instead. Fix your hydroponics system and eliminate the risks.


Why Give Greenhouse Gardening a Try?

Greenhouse gardening offers numerous benefits to greens aficionados who dare to take their gardening experience to the next level. Aside from acting as a shield against the effects of inclement weather, a mini, hobby, or semi-pro greenhouse can also serve as a protective layer that keeps harmful bugs and critters at bay.

What’s more, its enclosed structure allows you to control your plants’ growing conditions including the temperature, light, moisture, and ventilation of the greenhouse’s internal environment. With a controlled environment, you’ll be able to extend growing seasons and grow plants that aren’t native to your area.



No matter how well-informed you are about how to prevent root rot in hydroponics, you cannot completely eradicate the risks. Therefore, to avoid the worst-case scenario, you should be prepared to sacrifice the infected for the sake of others. While you’re at it, consider trying your hand at greenhouse gardening as well.


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