Growing cannabis can be somehow tricky. No matter how you take care of your cannabis plants, there is always room for a mistake. It is either you’re an expert or new growers, you need to be always aware of what is going with your cannabis plants, especially on their leaves to notice something is not right. Everyone knows that cannabis leaf problems are a sensitive plant, from the time you begin to put your seeds into the soil, throughout you harvest them. In this article, we will show you some common cannabis leaf problems that your marijuana might encounter.

Common Cannabis Leaf Problems

1. Yellow Tips on the Cannabis Leaves

A lot of cultivators notice that the tips of their cannabis plants are switching to yellow. And this is most likely because of the issue that is called nutrient burn. This occurs when you’re giving you cannabis plants a very strong mix of nutrients too often.

The nutrient burns start at the very tip of your cannabis leaf problems. This problem continues until the leaves turn crispy and brown just like burnt leaves. This will make your cannabis plant to grow slowly and drastically. And if you fix this issue you will lose a lot of leaves, which can lessen your total yields. 

And to cure this, you need to stop giving nutrients to your cannabis plants for weeks. This will make the plants takeaways excess nutrients. Always ensure that you follow all the guideline and don’t let you cannabis plant feed too many nutrients.

2. Powdery Mildew on the Leaves

Some of the most popular groups of fungi you may encounter as a marijuana grower, white powdery mold spores have mostly been attributed to high humidity in the growing space, combined with low to no airflow. The powdery material inevitably develops on your plants and will continue to spread and create more mildew while eating up your marijuana plants. It is safe to mist it with a mildew killing spray to remove the mildew. Decreasing humidity and rising the airflow in the rising room is also enough to stop it from returning.

3. Spider Mites on the Leaves

This outbreak is certainly one of the most destructive and hard to deal with. There is a fair chance you won’t be able to get rid of them if you don’t spot these guys early on. That’s why it’s so important to track your plants at all times and brush through them every few days so you can spot pests and other problems as early as possible. Spider mites, like most other bugs, escape from your fan leaves on the undersides so always test that plant as well. With the naked eye, it will be difficult to see this best so I suggest using the same tool that you use to look at trichomes because it will be good for zooming in on them. The mites will appear like spiders and will crawl on your leaves while nibbling.

4. Tiny Flying Insects Surrounding the Plants

Tiny insects hang out on the undersides of the fan leaves, similar to spider mites, except they are green and have long legs, much like a grasshopper. They are also pretty small so I also recommend that you use the trichomes scope to look at the tiny insects on your leaves. You’ll see them running around and what the insects are doing is extracting the nutrients and water from your fan leaves, causing them to die and wilt. Fortunately, ladybugs prefer to eat tiny insects so all you need to do is introduce them to your plant and they’ll do the rest. Be careful to take care of this ASAP problem as the tiny insects can wipe out tons of fan leaves very easily, resulting in lower yields. 

5. Light Burn

If your plant tops are too close to the rising lights above it will burn and yellow the leaves. The best way to detect this problem is to look out for the leaves that are closest to the light; first, they eventually turn yellow, and then it spreads through the plant to other places. As soon as you see this problem, lift the lights to 1 foot higher by 6 inches. The closeness of the lights is also dictated by its intensity and the state in which the plants are. Spend some time looking at the manual from which your lightings came, because it will also clarify the optimal distances to that particular light.

6. Heat Stress

This is the last issue on the list, but it is a very important one to measure for. As the title suggests, heat stress is a source of stress to your plants created by too high a grow room temperature. The temp will always be as close to 75F, and once it hits the low 80s, plant growth starts slowing down. This is the best way to say whether your plant has heat stress, and all you need to do to repair it is to lower the temperature to the correct levels.

7. Yellowing Leaves

Going to grow at the mistaken pH level is indeed one of the greatest common reasons people have issues with their marijuana plant. Mixing your nutrients and waterings at the correct pH is extremely important because it influences how your plant absorbs those inputs. If it is at the incorrect pH range, this can affect your plant going into a nutrient lockout, meaning it is essentially in shock and for the time being no longer absorbing nutrients.  It will be the first thing I always look for when someone has a problem with their plants because it is almost always the answer to that question.


So there you’re faced with the cannabis leaf problems, as well as all the ways to address them before your plants go too far!  Always note that the problem with most issues with the nutrient deficiency and the leaf is pH. And be sure to test that first before attempting to make some specific nutrient increase. In addition, also make sure your temperature and humidity levels are right and you are not monitoring the rising room for any pests. When you follow these measures you will eliminate the majority of issues straight off the bat.

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