![]() Excessive watering swells the cell, making it impossible for the plants to absorb enough water and leading to drooping leaves that start to claw slightly. Overwatering is a common mistake that beginners make when growing plants. For a high pH level, you may notice brown splotches taking over the whole leave. If your plants are experiencing a low pH level, you can spot yellow-to-brown splotches on the upper leaves at first and finally curling up leaves at the end. ![]() Incorrect pH LevelĪs a vital factor that affects the availability and uptake of nutrients by the plant, the pH level can easily affect your cannabis growth. To name one example, if your cannabis is given excessive nitrogen-rich veg nutrients, the leaves will turn dark and present a claw-like structure. Over-fertilized roots with excessive mineral content make it hard for your cannabis to remain optimized plant biochemistry. In contrast to nutrient deficiency, overfeeding can also be a problem. For example, a deficiency in nitrogen can cause the leaves to turn yellow and end up curling up as they die, while a deficiency in potassium can cause the leaves to appear burned and curled up at the edges. Nutrient DeficienciesĬannabis plants require a wealthy niche of nutrients to grow and thrive, and deficiencies in any of these nutrients can cause the cannabis to not grow the way you expect. Furthermore, pest infestations can cause a variety of symptoms, including droopy and twisted tops, blistered and glossy leaves, etc.Īlthough it can be hard to distinguish which mites cause the problem, all pests cause damage to your cannabis leaves and stunt the growth of the plant for sure. After sucking the sap from your leaves, these pests leave behind yellow spots on the leaves. Pest InfestationsĬannabis plants can attract a wide range of pests such as spider mites, aphids, thrips, and whiteflies, which all feed on the plant's sap. Or, you are placing the lights too close to your cannabis, so the heat your lights emit burns the leaves and causes cannabis leaves to curl inwards, especially the ones on the edges because they are generally closer to the light source. As a result, the leaves being exposed to strong light intensity get curled up to protect themselves. In case you are using any grow lights, say, HPS lights and LED grow lights, it’s likely the PPFD levels are excessively high for your cannabis growing. If you are able to identify underlying causes clearly, you can fix cannabis leaves curling up more effectively.īelow we’ve gathered some of the most common causes of cannabis plant leaves curling up: Light Stress and Heat Cannabis leaves can curl up due to various reasons, and it is often not one single culprit but rather a combination of multiple ones.
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