Marijuana Leaves Curling – How to Fix Them

marijuana leaves curling

Growing marijuana may seem to be easy, but sometimes problems arise that can hamper its growth. Then we ask ourselves what might have caused this problem and what we need to do to prevent them.

As your marijuana plant starts to grow and develop, it will also increase its leave and grow in height. Perhaps one day, you wake up and see that your plant’s leaves are curling, then something is wrong. You need to know what’s the matter with marijuana leaves curling and how to fix them.

What is “clawing”?

“Clawing” is the term given when the cannabis leaves are curling up and down. This phenomenon is also called “The Claw.” Clawing happens because of several reasons, and as soon as it happens, your plant needs special attention and must be cured, or else it will hamper its growth, or it might die.

What are the reasons why marijuana leaves curling, and how to fix them?

Clawing is a sign or signal that the cannabis plant is sick and needs to be healed. Seeing the leaves curling or clawing means that something is seriously wrong. There are several causes why marijuana leaves tend to curl up or down but do not worry because there are ways to cure them.

In this article, we have listed several causes of why marijuana leaves tend to curl and how to cure them.

Overwatering the Plant

We often think that when we water the plants, we keep them healthy all the time. That is not true. If we are not careful in watering the plants, it will drown the plant’s roots. Aside from drowning the plant, it will also rinse helpful microbes. Also, overwatering the plant persistently will attract parasites called Pythium, which can cause root rot. This will cause your plant to have claw-like leaves that will tell you that they are waterlogged.

To cure this, the first thing you have to do is reduce the volume of water you are giving your plant.  Maintain a wet-dry cycle. You can tell by their weight if they needed to be watered. If you can pick up your pots, then it is good for you. Another method to check if your plants need water is to press the soil and see if it is dry or too moist. If it is dry, try to water them with just the right amount; if it is still too moist, perhaps do it the next day. 


Feeding the plant with too much fertilizer is also not good. The excess dosage of nitrogen-rich vegetative growth base notes can cause the plants to leave to crawl or to curl up and down. Overdoing any vitamin or mineral-rich feeding to the plant will cause the leaves to curl as well, and it will scorch the tips.

The best way to cure this is to have a feeding chart to control what you give to your plant. Feeding charts usually come with every fertilizer that can be downloaded on their website. It is feeding your plant with fertilizer; it is best to start low and slow. You may increase the dosage over time. Check the leaves every day to see how the plant is responding to the feeding process. Make sure to measure what you feed them having the correct nutrient solution with the proper pH. The suitable pH is about 5.8pH to 6.0 pH.

Too Hot Temperature

Heat stress is hazardous to your plant. It can happen both indoors and outdoor cultivation, and it can even burn the leaves. You may see your plant’s leaves curling with brown tips. If you see these signs, then your plant may be suffering from heatstroke. This is a distress signal that you have to take notice of. The average temperature for your plant should not be over 28 degrees Celsius, and anything above that is harmful to your plant. 

To be able to cure this, make sure that you adjust the temperature to your grow room. For indoor growers, it is easy to adapt and to lower the temperature. You may utilize an air conditioning unit to cool down the temperature. Unfortunately, outdoor growers may have a bit of a problem controlling the temperature or exposure to the heat. Most cultivator uses a screen to shade to keep the plants slightly cooler. 

Too Cold Temperature

Just like hat stress, a freezing temperature is not also suitable for your plants. Cold weather can cause curly leaves as well. Prolonged exposure to cold temperatures, which is more than 10 degrees, can cause curly leaves and kill the plant. If it is caught with a high RH, buds will become moist, and I may get sick.

If the temperature is high for indoor cultivation, just add some more grow lights to increase it. Weather is tough to control outdoors, though, so for outdoor growers, the best way to deal with temperature change is to have an early harvest. The ideal temperature for cannabis plants is 20 degrees to 28 degrees Celsius. 


If you are planning to reproduce or to breed, it is essential to have healthy parent plants. Genetics will tell us that if the parent plants are healthy, they will also produce healthy offspring. In the case of an unhealthy parent plant, it will also pass on some disease to the offspring plant that would cause them to grow unhealthy. This may also be one reason why leaves are curling, so to fix the problem, you may need to feed your plant with much-needed nutrients or fertilizer to heal them from any kind of sickness.

Yes, growing cannabis can be easy and enjoyable, but it may also require much of your attention, especially in maintaining its health. The quality of yield depends on your plant’s health. If you happen to see that your plant is developing curly leaves, this is a sign that they are under distress. The tips that we have mentioned will help you identify which among the above mentioned factors is causing the leaves of your plants to curl. Though it can be cured, do not disregard the symptoms and do something right away to cure them.

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5 Responses

  1. I have a couple of leaves that have slightly curled up tips on the sides. Is this ok or am I doing something wrong?

  2. – Hello , My boyfriend stuck my plant out in the sun this morning til about ( Its kinda cold ) &&’d Now my leaves are curling down and my top stem is purple. Its was bright and pretty this morning .. Someone please help me ..

  3. The best way to correct light burn is to move you plant away from your light source, usually between eight and 20 inches depending on the watt and lighting type. Temperatures outside of the ideal range of 70 to 80 degrees Fahrenheit also risk discoloration and curl leaves. These oddities are most common in leaves toward the top of the plant and can easily be remedied with a fan (if too hot) or root insulation (if too cold). We also recommend growing plants off a cold cement or tile floor; use a milk crate or stool to raise them off the ground when necessary.

    1. Hey do you know of a particular pest that causes the leaves to curl under where they meet with the other leaf blades on the same leaf?…kinda towards the back of the leaf. I think it’s thrips but i could be wrong. Whatever it is they’re small and to hard to see and they are hiding under where the leaves touch.

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