How to Get Rid of Yellow Spots on Cannabis Leaves

How to Get Rid of Yellow Spots on Cannabis Leaves

Cannabis cultivation is a pursuit that demands diligence and keen observation, especially when it comes to maintaining your plants’ health. A common issue that cannabis cultivators face is the appearance of yellow spots on the leaves. This symptom can result from a number of underlying issues, each requiring a specific solution to rectify. In this article, we’ll delve into the various causes of yellow spots on cannabis leaves, how to diagnose the problem and provide you with practical ways to restore your plants to full health.

Identifying the Causes

Yellow spots on cannabis leaves can arise from several issues, including:

Nutrient Deficiencies

Specific nutrient deficiencies could lead to yellow spots on your cannabis plant leaves. Nitrogen, Magnesium, Calcium, Zinc, and Iron deficiencies are often the main culprits.


Both overwatering and underwatering can lead to the yellowing of leaves. An inappropriate watering schedule disrupts the plant’s ability to absorb essential nutrients, leading to yellow spots.

pH Imbalances

An incorrect pH level can harm your cannabis plants. If the pH is too high or too low, it can impair nutrient uptake, which in turn leads to the appearance of yellow spots.

Pests and Diseases

Certain pests and diseases could lead to yellow spots on the leaves. For example, Spider Mites and Fungal diseases are known to cause discoloration in cannabis leaves.

Diagnosing the Issue

Effective diagnosis demands careful observation. Examine the yellow spots carefully – Are they scattered randomly or forming a pattern? Have the leaves started curling? Are the plants showing any other signs of distress? Detailed observations and the process of elimination will help pinpoint the cause.

Effective Solutions for Yellow Spots on Cannabis Leaves

Once you’ve determined the underlying issue, you can employ the appropriate remedy.

Nutrient Deficiencies

Introduce a balanced Nutrient Solution that contains the elements essential for cannabis growth like Nitrogen, Phosphorus, and Potassium. If deficiencies persist, consider specialized nutrients to combat the individual deficiencies.

Watering Issues

If over or underwatering is the problem, reassess your watering schedule. Cannabis prefers a dry and wet cycle, so ensure the topsoil dries out before watering again. If underwatering is the issue, the solution is to water your plants more frequently.

pH Imbalances

Regularly check the pH of your growing medium. If you’re growing in soil, keep the pH between 6.0 and 7.0. If you’re using hydroponics, try to maintain a pH of 5.5 to 6.5.

Pests and Diseases

Implement a regular pest control routine. Introduce predatory insects or employ natural pest repellents to keep pests at bay. If fungal disease is an issue, remove the affected leaves and consider introducing a fungicide.

Prevention: The Best Cure

As the saying goes, “Prevention is the best cure.” Following sound cultivation practices like maintaining a clean grow space, providing optimal light, temperature, and humidity, using high-quality soil, and regularly inspecting your plants can prevent many issues, including yellow spots on leaves.


Yellow spots on cannabis leaves might be a common issue, but with proper diagnosis and appropriate steps, you can restore your plants to their full, verdant glory. Maintaining a vigilant eye, understanding the needs of your cannabis plants, and providing them with the appropriate care will ensure they grow strong and healthy, rewarding you with a bountiful harvest.

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