Yellow leaves on marijuana plants

Despite being a strong and resistant plant, cannabis can suffer from excess or lack of nutrients if applications are not done correctly. Pests can also appear if the grow room does not respect the proper temperature and humidity, among other things.

Luckily, the marijuana plant always speaks to us and these mistakes or deficiencies can happen in both expert crops and beginner crops. Regardless of the professionalism of the grower, if the problems in the marijuana plant are detected early enough, changes can be made in the practice that will help us to recover the plants.

To understand what happens to the plant, the most important thing is observation. The shape and color of a plant communicates a lot about the health of the plant and shows us tell-tale signs of what the grower is doing wrong or can improve – these are some of the most common foliar abnormalities.

Regarding the leave tips, when they are yellow, or slightly curled (apart from yellow) it may be a sign of a small nitrogen burn due to excess nutrients. Nutrient abuse is a common problem for beginning growers who assume more is better. It is best to read the product label and slightly reduce the dosage. After adjusting the amount, carefully evaluate the new leaves that are formed to see if the problem continues. Yellow leaves can also be a sign of heat stress. Keep the growing area at a constant 23/26 degrees to avoid this problem and keep the fans running even when the lights are off. PH levels can also cause this symptom.


During photosynthesis, leaves absorb light and carbon dioxide (CO2) and convert it into plant energy. Without enough light, the leaves will start to turn yellow and eventually slow growth to a halt. The solution is to increase the amount of light that the plant receives, lowering the light or with a greater lighting system.

Marijuana plants, such as Orange Blossom or Super Lemon Haze, like a wet-dry cycle for their roots. Plants with excessive or insufficient watering will fall and show symptoms through the yellow leaves. It is best to put a finger 2cm into the ground to check if it is dry or wet.

The pH of the water can be another reason why the leaves turn yellow. Controlling the level and regulating it is key to prevent this from happening.

When the yellow tips are left untreated, this symptom will get worse and spread over most of the leaf. To solve it you have to adjust the dose of nutrients correctly. Special care must be taken with substrates that already contain nutrients.

Learning how to examine cannabis leaves as a further step in growing technique is very important. This will allow us to treat problems early, and save the plant or prevent its production from being unsuccessful.

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