X Livechat Icon
Cannabis Leaf Problems: Diagnosis and Cure | Crop King Seeds

Cannabis Leaf Problems: Diagnosis and Cure

Cannabis Leaf Problems: Diagnosis and Cure

Cannabis plants are mostly resilient when growing. However, their health and strength can negatively be affected once the plant is depleted with important nutrients needed. Many cannabis growers, especially beginners in cultivating cannabis, usually face different problems in the course of their plant to grow, including cannabis leaf problems.

What to Do When Facing Cannabis Leaf Problems

If it is not early corrected, it can be possibly lead to cannabis plants to stop growing and can even lead to death. Facing such problems is part of the deal that you need to minimize for better plant growth.

As mentioned, cannabis plants are mostly resilient that can survive harsh surroundings or some pests and molds. It is very favorable as it let you easily figure out what are the problems and cure before they completely ruined your plant.

Do not be too agitated when something begins to happen in your plant. The ideal thing that you can do is to observed signs and symptoms of your plant. Identify the real problem and find a proper cure to early stop such problems.

Cannabis Leaf Problems

The following are the most common cannabis leaf problems, how to deal with it for a complete recovery, and the best future yield.

1. Yellow Leaves that Begins to Curl up

Once you notice that the leaves of your cannabis plant becomes yellow and started to curl up at the top part, the problem is most likely because of the light burn. Even most cannabis plants tend to grow more with much light, too much light exposure leads to yellowing the leaves near the light source.


The ideal part of the light burn problem is it can easily cure and does not make a long-lasting effect on your future harvest. The two major reasons why your plant has a light burn is maybe because the power of the light bulb you use is too strong for the cannabis plant, or maybe the light source place too close to the top part of the plant. You can easily fix it using moving the light source from the plant. If it is not possible, you can just reduce the power of your light source.

2. Dangling Cannabis Leaves

Cannabis leaves that happen to dangle will experience unyielding, making the leaves look like curling down. Overwatering is the most common reason why cannabis leaves become dangling. Overwatering does not only mean that you are providing too much water supply, but sometimes it indicates that you are providing water to the plant many times.


The ideal way to cure a dangling leaf is to make appropriate time for the watering period. Start watering your plant slowly until the leaves turn into the usual again. Make sure that the water you give can be drained out from the potted plants. Avoid watering your plant from the top of the soil, especially when you notice that the top of the soil becomes dry.

3. Small Brown-Colored Spots on Leaves

If you see some small brown spots on your cannabis leaves, this can be a sign of calcium deficiency. Most of the plants are required to have calcium to grow with a well-built structure and to help the plant protection from stress.

Once your plant is experiencing calcium deficiency, the upper part leaves of your cannabis plants are prone to exhibit brown spots. The lower part leaves become twisted and curl, and you notice the spots appear in brown, yellow, or sometimes copper in color.


When you encounter calcium deficiency, the first thing that you can do is to check your plant soil’s pH level. If the soil does not reach the normal range, then you flush your plant using clean water to correct the pH needs. The next thing you must do is to add nutrient which is rich in fertilizer that contains magnesium, calcium, and iron.

4. The Tip of the Leaves Becomes Yellow

Most of the beginner cannabis growers notice that the leaves of their plant turn into yellow. Once you encounter this, your plant is most likely experiencing nutrients burn. Nutrient burn commonly happens in your plants when you are feeding them with a strong mixture of nutrients or frequently than the normal feed. The tip part of the leaves started to become yellow and brown that looks crispy as it seems it burn. The burn usually started at the very tip of the leaves, so observe your plant if it shows the same as described.


The only cure with this problem is to avoid giving the plant any nutrients for the next few weeks. It can make the plant flush out the unnecessary nutrients, once the leaves become normal, avoid feeding your plant too many nutrients.

5. White Powdery Mildew in Leaves

It is one of the most usual kinds of fungi that you can possibly experience being a cannabis grower. Having white powdery mildew in leaves is commonly the effect of having too high humidity in the growing room. In time, the powdery mildew that forms in leaves will continue to spread and can produce more mildew while slowly eating up the whole cannabis plant.


The best way to kill the mildew is to mist it using mildew eliminating spray. You can also simply remove the affected leaves and place them in plastic bags. Also, by lowering the humidity level will increase the airflow in the growing room, making it stop the possible development of mildew.

6. Yellowing on the Outside Part of the Leaf Veins

If you notice that the outside veins of the leaves turn yellow and the veins inside remain green in color, your plant is likely experiencing an iron deficiency. Iron deficiency can slow down the overall growth of your cannabis plant, making the bud become to grow into thin size.

Once the iron deficiency is left untreated, the leaves will start to show evidence of burning tips. In time, the leaves will start to fall.


To save your plant, you need to increase the level of iron you provide. The root system best absorbs iron for about 6 to 6.5 pH range. You may also add iron as one of the supplements to nutrients of your feeding schedule.


To save the future yields of your plant, you must need to learn about different cannabis leaf problems and how to deal with it. Make sure to check the leaf and observe where the deficiency comes from before trying to increase or lessen any particular nutrients needed. Also, make sure that the temperature and humidity levels are right to prevent any pest appear in the growing room.


Leave a Reply

Your email address will not be published. Required fields are marked *


Join Our Small Growing Community

Get the cannabis news, resources and tips to help you and your growing adventure succeed.


We will inform you when the product arrives in stock. Please leave your valid email address below.
What are looking for in cropkingseeds.ca?