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What Temp Should Your Grow Tent Be?

Eric St-Cyr | March 09, 2023 | 11 MIN READ

Possessing the ideal growth circumstances might boost your crop's output and potency. There are many intricate aspects to growing herbs indoors, but one of the critical considerations is the surrounding temperature.

What kind of atmosphere is ideal for cultivating plants and creating high-quality herbs? What are the ideal conditions to avoid root rot and mildew, have healthy plants and encourage vegetative growth? Temperature control may be used to produce herbs with the best outcomes.

Every plant has an ideal temperature range where growth and development are maximized. For an indoor grow, it's crucial to keep temps steady to maximize outcomes. Recreating a plant's original environment is to provide it with as near-ideal circumstances as possible.

How to develop the perfect environment and proper temperature for indoor growing?

It's not always simple to keep your plants at the ideal temperature. Some would argue that it is equally as much art as science, but that doesn't imply you can't solve the problem. A few things must be learned first, which will be provided in this article.

We will explain why the temperature of herbs is more complicated than just degrees and becomes much more so when it comes grown indoors and seeking the ideal environmental conditions. Additionally, we will demonstrate how to identify and fix temperature-related issues in your grow tent.

Continue reading to for a complete guide about herbs growing at different temperatures, or jump to your favorite part.

What is Temperature?

This query is frequently asked, particularly in introductory science classes. The most typical response goes like this:

The average kinetic energy of the particles in an item is measured by its temperature. These particles move more quickly as the temperature rises.

Although it's not the finest definition, it's not the worst neither. You ought to be aware of a ton of additional odd facts regarding temperature.

Why is Temperature Important for Plants?

Knowing the ideal circumstances for plant growth is crucial for farmers and producers. Most farmers and producers in the past learnt the ideal time of year to sow particular crops simply by experience.

We no longer depend entirely on the seasons and weather because of contemporary technology and the cultivation of plants in greenhouses and other controlled settings. The best circumstances must now be known, and our surroundings must be modified accordingly.

For each plant, it is possible to study a variety of variables and environmental factors, including temperature, light, air, water, soil, pH, and nutrients.

High temperatures, in a variety of ways, impact plant development. The effects of heat on photosynthesis—in which plants convert carbon dioxide into oxygen—and respiration—in which plants convert oxygen into carbon dioxide—are the most noticeable.

How plants make their heat

Although plants are largely self-sufficient, they have a disadvantage in temperature. Plants can't make their heat, even though it is essential to their well-being. A herb plant is reliant on its surroundings especially the soil temperature, unlike animals and people.

Although too much heat usually doesn't cause herbs to die, it might slow their development. High outside temperatures (over 80–90 °F) during flowering will hinder bud development and lessen their strength and scent.

Ensure the outside temperature is controlled throughout the flowering phase if you want to cultivate buds with lots of cannabinoids. You should be concerned about ideal temp just because of the quality of your buds.

How to keep warm temperatures in a grow tent during the winter months?

In the winter months, there are various techniques to keep a grow tent warm:

  • Insulate the grow tent: Insulating the grow tent will aid in retaining internal heat and preventing heat loss. Materials like reflective insulation or foam insulation can be used for this.
  • Increase the temperature inside the grow tent by using a heater. Heating mats or space heaters can be used for this. To avoid overheating, be careful to keep an eye on the temperature and humidity conditions.
  • Use a grow light: Use a grow light to help increase the temperature inside the grow tent. Grow lights emit heat. Remember that grow lights can increase humidity, so make sure your space is properly ventilated.
  • Seal the tent: To stop chilly draughts from entering the tent, seal any openings like windows or vents.
  • Utilize a thermostat: By using a thermostat, you can maintain the grow tent's temperature at an ideal level for your plants while guaranteeing that it is consistently maintained.
  • Keep the tent in an insulated space: To help maintain a stable interior temperature, place the tent, if at all possible, in an insulated room or space.

The winter months are critical for flowers in indoor grow tent. This is why you need to pay special attention and avoid temperature fluctuations and target optimum temperature so you can have flowering plants.

Ideal Temperature Levels According to Growth Stages

Seedlings and Clones Stage of Growth

For clones, a temperature range of 68–77°F (20–25°C) with high humidity is optimum. They ought to soon develop roots and become more independent at these temps. Temperatures like these are suitable for seedling stage.

Vegetative Stage of Growth

The optimal temperature for the vegetative stage is between 68 and 77 degrees Fahrenheit (20 and 25 degrees Celsius), with moderate humidity and somewhat colder temperatures throughout the night. The 'night' times are colder and ideal for promoting development. Keep the temperature above 59°F (15°C). Once the plant reaches maturity, it ought to be able to resist daytime lows that are colder and drier air.

Flowering Stage

Your plant can flourish in a cozy area with low humidity after it has reached the blooming stage. An optimal temperature for your grow environment is under 82°F (28°C) unless you add more CO2. Before burning, you may smell and savor the potent, trichome-rich buds produced at these lower temperatures.

Avoid temperatures over 82°F (28°C), which limit bud development and cause terpenes to dissipate. By practically burning away the beneficial components of your buds during this period, you risk leaving minimal flavor or aroma by the time you harvest them.

Late Flowering Period

Plants reach maturity during this six to twelve week period. Careful monitoring of the temperature and humidity is required at this period. To increase the productivity, flavor, and look of the plant, it is advised to reduce humidity levels by between 30 and 40%. There is a potential temperature range of 70 to 80 degrees Fahrenheit.

Let's Talk About Humidity

It would be negligent to discuss temperature without also mentioning humidity. Relative humidity and temperature are interwoven, and distinct effects result when one or both are excessively high or low.

The grow chamber's relative humidity of between 40 and 60 per cent is ideal. During flowering, it's crucial to stick closer to the bottom end. For the best herbs production, the humidity and temperature of the grow room must be jointly managed.

The ideal temperature and humidity for growing weed are appropriate for the plant growth stage and maintaining a constant humidity to reduce the danger of mold and mildew.

It's essential to understand how to regulate the temperature and humidity in a grow tent to avoid producing throwaway buds that serve as a teaching tool.

The Ideal Temperature and Humidity Level for Herbs

To encourage healthy development in herbs plants, humidity and temperature levels should be controlled at each stage.

This is because the plant's requirements and capacities change as it grows. For instance, a plant's root system is not as strong while it is young as it is after it is grown. This will impact its capacity to absorb nutrients and water, which will impact its rate of transpiration and its preferred humidity and temperature ranges.

Remember that these standards are widely recognized as industry best practices and that every producer has different preferences for the highest quality, aroma, potency, and color. During different periods of the growth stage, some growers may experiment to get the perfect temperature and humid conditions to achieve a specific stress response or expression that affects the final result.

Since the leaf temperature tends to be slightly lower with lower-wattage LEDs, most growers choose to keep the air temperature somewhat higher with LED illumination than with HID lighting. The intensity of the LEDs and manufacturer guidelines will change this, though.

Establishing the Ideal Atmosphere

Your plant's habitat has to be considered whether you are growing indoors or outside. For them to flourish, try to produce the optimal conditions.

Outdoor Growing

Keeping your plants warm might be difficult when growing outside. The good news is that most outdoor cultivars can flourish in conditions as low as 50°F (10°C). Despite this, a temperature of 50 degrees is still not optimal since it tends to inhibit tissue development and photosynthesis later in the day.

The tissue can be harmed by temperatures below 40°F (4°C).

You can maintain the temperature of your plant outside. Consider using:

  • Gas patio heaters
  • Polyethene covering

On chilly nights, both solutions help keep gardeners warm. Additionally, the covering shields plants from other hazardous weather conditions. The goal is to keep the temperature at or above 60 degrees to encourage plant development.

Indoor growing

Almost all indoor growers control the temperature, giving them as much leeway for failure as for success. All you have to do is ensure the temperature in your grow room stays at the right level.

Here is the issue:

Your grow room's optimal temperature will vary depending on several variables. For instance, the location of your room within the structure is crucial. Compared to an attic with a flat roof, a grow room in the basement is much more relaxed.

In addition, factors like the size of your area, the ventilation, the quantity of lighting, and the extraction rates are crucial for indoor plants. Remember this while constructing your grow chamber.

What Happens if the Temperature is too High?

Since herbs plants seldom perish from excessive heat, hot temperatures are often less of an issue than cold temperatures. However, due to the photosynthetic enzymes' inability to function correctly at temperatures above 30°C, your plants will develop more slowly.

Heat not only stunts development but also draws bugs and illnesses. For instance, spider mites and white powdery mildew favor warm climates.

Additionally, water will evaporate more quickly from your plant's soil in hot weather. Your plants may have trouble absorbing the nutrients in the soil, and you'll need to water them more frequently. This may result in a nutrient burn, which harms the roots and leaves of your plant.

Also, remember that excessive humidity and temperatures might expose your plants to many other problems. Without adequate ventilation systems, plants growing in hot, humid circumstances can develop bud rot or mold, which puts the plant under a lot of stress and effectively kills the buds you've been trying so hard to cultivate all season.

What Purposes do Temperature and Photosynthesis Serve?

Green plants use sunlight to generate nutrition from carbon dioxide and water through a process known as photosynthesis. Up to a point, the temperature has a beneficial effect on photosynthesis. However, if you overheat your plants, it may begin to damage them, slow down their development, and even kill them.

Your plants may suffer if you don't provide them with adequate heat, though. The quality and quantity of your plants will be much improved after you optimize your grow room. They may seem like whiny toddlers, but your plants will flourish once you do.

Thermostats/Controllers For Herbs Temperature

The temperature of the herbs is controlled by thermostats, which detect the temperature and control it by activating or deactivating the heating or cooling system.

Some homes use a centralized thermostat that regulates the entire home's temperature. You may also discover a few homes with several thermostats, which let you regulate the temperature in practically all of the house's rooms.

No matter the time of day, a single-stage thermostat maintains the same temperature. Despite being a little more expensive, two-stage thermostats let you set and maintain different herbs temperatures day and night.

Thanks to modern digital thermometers, you may adjust the temperature four (4) or more times per day, seven (7) days per week. Thus, it is possible to experience a range of temperatures throughout the day, such as a morning temperature of 70°F (21°C), a midday temperature of 76°F (24°C), an afternoon temperature of 74°F (23°C), and a nighttime temperature of 72°F (22°C).

You can more effectively control the temperatures of your home and herbs by setting the thermostat at various levels throughout the day. Modern digital thermostats are worth investing in since they will save you more money over time.

Measuring Temperature

Measure the temperature in your application at several points to obtain a sense of its precise value. The temperature must be evenly distributed within the desired temperature range.

Take your thermometer to numerous locations across the growing area to acquire precise readings, but be mindful of hot areas. Don't measure temperature beneath the light if you want to be innovative.

Inaccurate measurements may result from this since light bulbs radiate heat. Make sure you are also holding the thermometer in the shade.

The globe emits heat, although it differs from the ambient temperature, and you want to know the exact tent temperature. It would be beneficial if you were also aware of the precise location of the light bulb.

The tops of the leaves will burn if it is too close to them. Even if the temperature in the shadow is ideal, your plants will suffer if the lightbulb is too close to them.

How to Control Temperature in a Control Room?

Step 1

In addition to monitoring the temperature in your grow space, it's also critical to understand the relative humidity levels there. Therefore, to perform this, you need a device that can measure both humidity and temperature at the same time.

In the end, you need to locate an accurate thermometer. There are affordable ones on the market, but they give you an inaccurate reading and are a few degrees off.

To ascertain the actual room temperature, it is advised that you buy two or three of these thermometers and take the average.

However, if you have the money, spend it wisely and buy a high-quality thermometer.

Step 2

Download a chart of suggested temperatures from the internet or note them for each stage of your herb plant's development.

Step 3

Following the acquisition, usage, and average reading of a thermometer, you should adjust any temperatures that are too high or too low.

Several tools are available to assist you in regulating the temperature of your room's temperature. Purchasing an all-in-one air conditioner is one option.

Why Oxygen is Important When Watering Plants

Water is made up of hydrogen and oxygen, yet the amount of oxygen in a body of water varies depending on the temperature, pressure, and bacterial population.

Your plants will develop considerably more robustly since oxygen makes it simple to absorb nutrients. Because of this, achieving the ideal level of oxygen in your water might be challenging without considering the temperature.

To aid in their plants' vigorous and healthy growth, many growers use air pumps for their water or nutrient tanks. However, to accomplish this effectively, you must closely monitor the temperature in the tank.

Plant Water Temperature in Herbs Grows

There is no one standard for how you should care for every single plant since every plant is a unique entity. There are several distinct strains which may be cultivated in various environments. But each of them still needs water at a comfortable temperature—neither too hot nor too cold.

We strongly advise maintaining the temperature between 20 and 25°C if you want your plants to have strong roots that can absorb nutrients. 23°C is the ideal temperature, providing the ideal level of oxygen. At this temperature, your plants should be able to absorb the most nutrients, promoting robust and healthy development.

The Takeaway!

Temperature significantly impacts how effectively your plants grow. Therefore, you can control how well your plants develop if you can determine how hot or cold your grow room is during the various growth phases. More significantly, you'll be able to act appropriately to fix anything wrong.

Please don't hesitate to contact Canada Grow Supplies if you have any queries regarding the appropriate temperature for your grow room or if you want to find out more about grow tents, check out the Grow Tent Ventilation Guide.


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