Heat during the flowering stage also causes fox-tails, which are airy and don’t have much substance to them. It’s basically the same response as growing new buds on top, it just looks a little different on some plants. The plant is basically “abandoning” the original heat-damaged bud to try to make a sad new one.
Example of unwanted “fox-tailing” caused by too much heat. Control heat by whatever means necessary using the steps outlined below. Indoors , find a way to lower the temperature and/or increase the circulation in the grow room or grow area if heat is the problem. Having a small fan blowing over the tops of your plants will help prevent hot spots from forming directly under your grow lights. How far away should you keep your grow lights from your plants? You may consider removing grow lights further away from the tops of the plants if heat is a problem. When growing cannabis, it’s best to try to keep things at a comfortable room temperature at all times for optimal growth. If it’s too hot for you, it’s probably too hot for your plants. If you can keep your roots cool, it will help your plant deal with heat affecting the top of the plant.
If there’s some way to protect the roots from heat, do it! When cannabis plants are recovering from heat shock, some growers recommend using seaweed kelp extract (often available as a convenient liquid fertilizer) to help plants recover from the stress and possible even protect plants from heat stress in the future. Many indoor setups will require that you vent out hot air using a fan and/or an exhaust system. By creating good suction with an efficient exhaust system and adding a carbon scrubber, you can also pretty much scrub all smells from the grow room. Learn more about controlling odors in the grow room. An oscillating fan will circulate air in the room as well as provide a gentle breeze for your plants, and a small one will cost less than $20. Outdoors , you have less options to reduce heat during a heat wave, but you are able to monitor your local weather via weather forecasts. It is possible to partially shield your plants when you know the temperature is going to get hot. You can also adjust your watering schedule to make sure plants at least have plenty of water. Some things to try when you know the weather outside is going to be hot or dry: water plants in the evening or early morning to help prevent water evaporation during the hottest hours keep roots cool – for example by putting your potted plant in a ceramic pot to help insulate the roots from the sun. I’ve also heard of growers digging a hole in the ground to place their potted plant inside, because the ground is usually cooler than the air when the temperature gets high kelp extract for roots – provide a small amount of liquid fertilizer that contains seaweed kelp extract (can help protect against heat stress) increase shade to reduce the heat experienced by plants – you can use an old sheet or other cloth as a short term solution, or get a profesionally made “Sun Shade Sail” which is made particularly to create shade outdoors. It’s important to remember that giving plants shade for more than a few days will make them less “hardened” to the sun, and you may need to reintroduce full sunlight back slowly to prevent them from getting shocked from the light intensity move potted plants – luckily with potted plants, it’s usually easier to move them out of direct sunlight during a heat wave take extra good care of heat-stressed plants – when cannabis plants appear heat-stressed, try to baby them as best you can, and offer shade during the hottest days. When growing cannabis outdoors, it can often take a few weeks for plant to recover after a hot or dry spell, so prevention is the best medicine for outdoor plants. Your plants can only withstand a certain amount of heat and light. After a certain point, your autoflower will start showing signs of stress on the bud or leaves. Your leaves can get yellow or brown, appear burnt or bleached, it's also common for the leaves to fold in a taco shape all of those symptoms and more we’ll explain here. Heat stress can happen indoors or outdoors, it occurs when your autoflower is exposed to high temperatures for a long period of time. This can cause a wide variety of problems, stunting growth, affecting yield and ultimately killing your plant. Heat stress indoors is a result of not adjusting your climate for optimal growing. Outdoors it’s harder to control but in both situations, heat stress is caused by the same factors: low humidity, high temperatures, and high light intensity. Let's examine heat stress factors and learn what solutions can be applied to each situation. The ideal humidity for an autoflower is 60% depending on the stage it’s in.
Very low humidity can make plants more likely to get heat stressed. Sometimes you’ll get symptoms that look like heat stress even if it’s not that hot, they can be worse because the plant is being affected by very low humidity. Low humidity won’t stress your plant, it can affect growth and yield but there won’t be any apparent symptoms unless it is combined with high light intensity and/or high temperatures.
If you’re growing indoors, there are a couple of solutions. You can use a humidifier for a long term solution or you can place buckets filled with water inside or around your grow tent, always checking the hygrometer to keep humidity at an optimal level. Outdoors there’s not much you can do, try to place your plant in the shadow for a few hours a day, we also recommend to water more times with less water throughout the day, this should keep the roots cooled down. The optimal temperature to grow autoflowers is around 25 Celsius (77f).