As cannabis cultivators, you understand the importance of protecting your plants from temperature extremes- but too much heat can be just as damaging as too little. In this post, we’ll discuss the signs of heat stress in your plants and suggestions for avoiding it by ensuring the proper heat tolerance for your crop.
Heat stress is an indication that your plants are too warm for healthy growth and development. Heat stress can take many forms, from stunted growth to leaf wilting, discoloration, and increased droop. The more intense the heat damage, the more severe the effects can be, including decreased yields and lower-than-expected potency.
Addressing Heat Stress
If you want to address heat stress in its early stages, take steps to ensure that your plants have the right temperature range. A good rule of thumb is to make sure the temperature never exceeds 83 degrees Fahrenheit during the day and no higher than 75 degrees Fahrenheit at night. Additionally, make sure to keep your plants in a shaded area and consider using fans to keep the air circulating, as stagnant air can create hotspots.
Signs of Heat Stress
Your plants will give you signs if they’re having trouble with heat. Keep an eye out for wilting leaves, discolored foliage, and slower-than-expected growth. And if you haven’t done so already, set up an alarm system in your grow tent that will alert you if temperatures start to get too high.
Preventing Heat Stress
The best way to prevent heat stress is to keep your plants in the proper temperature range from the get-go. Depending on your environment, this may mean running an air conditioner during the summer months, providing shade in the grow area, or using supplemental lighting and fans to ensure proper air circulation. Regularly checking the temperature of your plants is a great way to catch heat stress before it becomes a major issue.
Not all cannabis strains are created equal when it comes to heat stress. If you live in a warm climate or an area with prolonged summer heat, consider growing heat-tolerant marijuana strains such as OG Kush, Sour Diesel, Blue Dream, or White Widow. These strains are specially designed to tolerate higher temperatures, and often produce much more resilient plants that are better able to withstand the heat.
Lighting & Air Temperature
Another way to protect your marijuana plants from heat stress is to check the quality of the light and air temperature in your grow tent. Make sure the light source isn’t too close to the plants, which can cause the area to become too hot. Additionally, check the air temperature to make sure it’s not exceeding 83 degrees Fahrenheit- anything higher than that is too hot for growth.
Water & Nutrient Management
Cannabis plants can become stressed when they don’t get enough water or nutrients. Too much heat can cause the soil or rooting medium to dry out quickly, so make sure to provide adequate irrigation. Check the nutrient levels in your water solution, as well as the pH balance. Make sure the pH is not too high or low, as this can lead to nutrient deficiencies and poor growth.
Ventilation & Humidity
When temperatures rise, it’s important to pay attention to humidity and ventilation levels in your grow space. If the air is too dry, plants can become stressed and die. Likewise, if the air is too humid, respiration rates slow down and leaves can become too damp, inviting mildew and pests. Investing in a fan or vent system, as well as an air humidifier, can help ensure humidity stays within an acceptable range.
Troubleshooting Heat Stress
It’s important to keep a close eye on heat levels in your grow room and make sure temperatures stay within an acceptable range. If you notice signs of heat stress, make adjustments to the environment to cool it down. For example, setting up a cooling fan or adding more insulation to the grow space can help regulate the temperature.
Using Cooling & Heating Systems
If your grow tent is getting too hot, consider investing in a cooling system. There are dozens of these products on the market, and they range in price from a few hundred dollars to thousands, depending on size and features. Likewise, if you’re trying to cultivate marijuana in a cooler climate, you may need to invest in a heating system to warm up the room.
Minimize Heat Transfer
Finally, take steps to minimize heat transfer in your grow tent. Make sure to use light-blocking and heat-resistant material on the walls, and add additional insulation to keep the heat out. Additionally, consider using dark-colored grow containers, as light-colored containers can act like a reflector and cause the surrounding temps to rise.
Heat stress can be a major issue for cannabis growers, so it’s important to take steps to ensure your plants have the proper heat tolerance. Set up an alarm system to alert you if temperatures get too high, keep an eye out for signs of heat stress, and invest in cooling and heating systems to regulate the temperature in your grow tent. With the right precautions, you can combat heat stress and keep your plants healthy!