Cannabis plants are extremely diverse and can grow in many environments. Growing indoors or outside in a hot climate that presents frequent challenges can be difficult, and oftentimes will affect the final yield and flower quality. In this article, we explain how to protect your plants, symptoms of heat stress, indoor and outdoor marijuana heat stress, and the 3 best Seedstockers’ cultivars to get you through any tropical weather!
If you are new to growing, then you may not be familiar with thermal / heat stress and how it will influence your precious plants. In the same way Cannabis plants can have negative reactions to cold and wet weather the same occurs with high temperatures, heat waves and drought conditions. It can be much harder to cool a room down than it is to heat it up, and heat stress can be devastating if not treated and a long-term solution set in place.
It is critical to understand that Cannabis plants will perform the best indoors when grown at 24 degrees Celsius / 75.2 degrees Fahrenheit. Depending on if the plants are in a vegetative state or flowering, the relative humidity will correspond to the preferred temperature, so for example 75% humidity during 18/6 and close to 35% humidity during 12/12.
How a grower can control these temperatures to ensure that the plants do not exceed this optimal zone, can be down to many variables. How many lights they have, efficiency of their extraction, if they are using Co2 and most importantly what the temperature of the air outside has become.
The way that Cannabis plants will use water available in the growing medium, is by transpiring through their leaves. Water is drawn up from the root zone and passed through the foliage. Transpiration occurs in the same way a human produces sweat to cool down.
When transpiration occurs with Cannabis plants, depending on the temperature, humidity levels and airflow, moisture can leave the plants rapidly causing the plants to suffer stress. The results can be plants that become dry, crispy and showing early symptoms of nutrient deficiency at primary or trace element level. Below are 8 signs to look for when diagnosing your Cannabis plants with thermal stress.
Protecting Cannabis plants from heat stress is straightforward to do, once you have the awareness of what can cause it. Growing Cannabis indoors can often be easier than outdoors, due to the fact the grower can manipulate their temperature and humidity. This can be aided with the use of temperature fan controllers and digital sensors that maintain a set temperature and humidity.
There are a few different ways to combat a heat wave and high temperatures outdoors. Some of these may sound counter-productive, however in the long run will pay off massively.
Should I water cannabis plants that suffer from heat stress?
Once the health and vigor of a Cannabis plant have become directly affected by heat stress, with visible and clear signs, restoring the plant’s health can take some time. The best way to resolve any issues caused by heat stressed plants is to keep away from direct sunlight, high U.V levels and do not let the root zone become hot and dry. Foliar spraying your plants using a seaweed solution is a great way to restore health, and enhance the thickness and waxy appearance.
What are the most resistant Seed Stocker’s strains to temperature changes?
Santa Marta – A cross of Amnesia Haze and Santa Maria that can endure hot climate and is exceptionally resilient to heat stress.
Thunder banana – A super resistant strain that is a cross of Alaskan Thunder Fuck and Amherst Banana, that thrives under tropical weather.
Sour Diesel- A classic and extremely tough plant when grown outdoors. She can take on high temperatures and drought conditions with ease.