Grow Room Too Cold: How To Fix It?

When it comes to growing marijuana, temperature plays a very crucial role in the growing process. Too much cold or too much warmth will eventually damage the plant and rot the roots, leading to destroying all your efforts. Especially in areas with cold temperatures, you need to ensure that the grow room you are growing the indoor plants in, is kept at an optimal temperature so you don’t end up damaging all your efforts from the get-go. Investing in good quality LED grow lights can take care of this issue to an extent but that is not all.

You need to invest in a good quality kit and accessories to ensure that the inside is lightproof and comes with enough warmth from the grow lights to contribute to their uninterrupted growth from the start till the end.

Why is it important to maintain ideal temperatures in a grow room?

Unlike the naturally grown outdoor plants, grow rooms are used for highly sensitive indoor plants that require specific temperature and humidity settings for optimal growth. For the best yields, maintaining the temperature is key. If the temperature is too low, it will end up damaging the plants and if the temperature is too warm, it gives leeway to the growth of microbes.

Temperatures that are too cold, often below 15 degrees Celsius end up shocking the plants, leading to substantial damage. However, the same goes for higher temperatures too. If the grow room becomes warm beyond requirements, it will slow down the bud growth resulting in loose and airy options.

What are the ideal temperature settings in a grow room?

Unless you have used grow rooms a lot, you wouldn’t know the ideal temperature settings that are required inside the best grow tent. Not just the grow lights, a good quality grow tent also makes a lot of difference in maintaining the optimal temperature settings.

So, if you are missing out on that, we’d recommend that you keep a check on the growth phase of the plants in the grow room and then move ahead with the temperature settings as needed during that phase.

• Vegetative phase

While the majority of the growers tend to focus more on the flowering phase of the plants in the grow room, the vegetative phase plays an equally important role. Depending on the plant you are growing, the temperature inside should be between 20 to 30 degrees Celsius. The vegetative phase is when the plants start maturing and growing out leaves, buds, and branches.

If the temperature setting isn’t optimal, it will end up slowing down the growth and result in lesser yield in the end.

• Flowering phase

Following the vegetative phase is the flowering phase of the plant. Generally, during this growth stage, the temperature should be between 18 to 26 degrees Celsius if you want optimal growth without any hassle. This is the phase where the buds grow and mature and end up giving flowers that turn into fruits or vegetables in the long run.

Maintaining lower temperatures can help the bud grow better and healthier with better smell and density. Try to maintain the temperature low during this phase, depending on the plant inside. Some grow rooms even have as little as 10 degrees Celsius during this phase.

What are the signs of a Too Cold grow room?

If you don’t pay close attention and leave the grow room to be too cold, chances are that it will end up causing irreversible damage to the plants. So, being vigilant is crucial, especially during the flowering phase of the plant.

There are several common signs of a grow room being too cold. Some of the pivotal ones include:

• Loss of color in the plants
• Growth of molds
• Change in the density

If you notice these symptoms and witness the same getting worse over time, you’d likely need to do something immediately to prevent permanent damage. You will also notice signs of change in the color and smell in the grow room as well.

What kind of issues can you face with a cold grow room?

While beginners won’t understand this, a cold grow room will eventually result in a lot of issues in no time at all. Most of the time, you will face issues that heavily impact the growth of the plants in the room.

There can be common issues like:

• Compromised oxygen level
• Less germination
• Dampening of the environment
• Root rot (eventually)

Out of all the complications, the low germination rate is what you need to be mindful of. Low germination of the plants will delay reproductive growth, affecting the yield in the future. Also, the increased dampness in the room will result in the outgrowth of mold, a further crisis that will damage the growth of the plants.

How to maintain an ideal temperature of the grow room?

While we have discussed what the ideal temperatures should be inside a grow room, maintaining it is what matters in the end. If the grow room’s temperature isn’t optimal and too cold, it will affect the growth of the plants along with the yield.

The best way to maintain the ideal temperature settings is by following the steps mentioned below:

• Keep a check on insulation and light

Grow rooms require optimal air circulation and good light settings inside. While the air circulation keeps the oxygen levels in check and prevents dampness, the light will provide the plants with enough warmth that it needs to grow optimally without any damage.

The best way to improve air circulation is by using a circulating fan. This will keep the temperature in check and prevent risks of damage to the plants due to heavy alterations in the temperatures.

However, if you are growing plants that don’t stand cold temperatures, the best way to fix that issue is by installing a heat lamp. This will prevent the risks of the inside temperatures getting too cold and maintain the optimal settings required.

Also, another way to reverse the too cold temperature inside the grow room is by placing heating mats on the floor of the grow room. This will keep the plants warm and prevent risks of damage.

• Invest in a heater

While it is easier to reduce the temperature of a grow room, increasing the warmth can be a bit tricky. However, one easy way to do this is by placing a heater inside the grow room. This can effectively reduce the risks of the temperatures dropping too much and keep your plants in the best condition possible.

Also, if heaters are too high temperature for your grow tent, you can install high-intensity LED grow lights in the room to keep the temperature warm and even mimic the settings of the sunlight for optimal growth.

Use a thermostat radiator

Another effective way to increase the temperature inside a grow room is by using a thermostat radiator. However, we’d only recommend doing this if you have a larger grow room with ample space and proper venting. 

The majority of these radiators come with adjustable settings that you can control according to your needs. These are also portable and compact, which means that you wouldn’t have to worry about the device taking up too much space around the grow room.

Use warm nutrients

If nothing else seems to work, the next best thing to do is switch to an aquarium heater and supplies the warm nutrients through the reservoir. When the temperatures drop suddenly, it is the roots that face the maximum wrath, which means that you need to focus on that first to prevent risks of damage. 

Heat the nutrient solution using the aquarium heater and you are pretty much good to go. Supplying warm nutrients to the roots can help rejuvenate them and ensure that the plant grows optimally.

FAQs

What happens when the temperature in grow room drops?

If the grow room’s temperature drops drastically, the first thing it will do is damage the roots of the plant. It also results in discoloration and other complications that are mostly irreversible. It can also affect the enzyme activity of the plant.

Can plants recover from the cold shock?

Yes and no. It depends on the degree of damage. If the cold shock has only affected the leaves, chances are that the damaged leaves will fall off and new leaves will grow in that place. Once you restore the warmth, it should get back in shape again.

Should I remove fan leaves during flowering?

Yes, it is ideal that you remove fans during the flowering phase. It ensures faster growth and lesser damage.

What should be the ideal grow temperature for cannabis plants in the vegetative phase?

The vegetative phase of cannabis plants plays an important role. Depending on the plant you are growing, the temperature should be between 20 to 30 degrees Celsius. This is the phase when the plants start growing out buds, leaves, and branches.

How do you know when the temperature in the grow room is too cold?

There are many common signs that indicate that the grow room temperature is too cold. Some of the key signs are:

• Loss of colour in the plants
• Change in the density
• Mold growth

What problems can a cold grow room lead to?

When the temperature in your grow room falls, it can lead to various problems in your plants. Common issues include compromised oxygen level, dampening of the environment, less germination, and rotting of the roots.

Can a heater help you increase the temperature in your grow room?

To increase the warmth in your grow room, you can use a heater. This will reduce the risks of the temperatures dropping too much. If heaters are too much for your grow tent, then you can opt for high-intensity LED grow lights.

Conclusion

Grow rooms are highly sensitive, which means that you need to keep an eye out for the temperature settings. Just ensure that you know the correct temperature settings if you want better yields. Also, warmth is one of the most crucial parts of a plant’s growth and if you aren’t providing that, it will eventually end up damaging the plants for good.