Why Are Your Calathea Plant Leaves Turning Yellow:
Causes and Solutions

Calatheas are beautiful indoor plants that are known for their vibrant foliage and air-purifying abilities. However, if you notice your Calathea plant leaves turning yellow, it can be quite concerning. Yellowing leaves can be a sign of various issues, including overwatering, underwatering, pests, disease, or environmental stress.

In this article, we will discuss the causes of yellowing leaves in Calathea plants and provide some solutions to help you bring your plant back to good health.

Causes of Calathea Plant Leaves Turning Yellow

Overwatering

Overwatering is one of the most common reasons for yellowing leaves in Calathea plants. When you water your plant too frequently or give it too much water at once, the roots can become waterlogged and start to rot. This condition is known as root rot and can cause the leaves to turn yellow and wilt.

Underwatering

On the other hand, underwatering can also cause yellowing leaves in Calathea plants. When you don’t water your plant enough, it can lead to dehydration and stress. As a result, the leaves may turn yellow or brown.

Pests

Calathea plants are prone to pest infestations, which can also cause their leaves to turn yellow. Spider mites and mealybugs are common pests that feed on the sap of the plant, causing damage to the leaves and turning them yellow.

Disease

Fungal diseases such as leaf spot and bacterial infections can also cause yellowing leaves in Calathea plants. These diseases can spread quickly if left untreated and cause permanent damage to your plant.

Environmental Stress

Lastly, environmental stress such as exposure to direct sunlight, cold drafts, or low humidity can cause your Calathea plant leaves to turn yellow. These conditions can affect the plant’s ability to absorb nutrients and lead to yellowing leaves.

Solutions for Calathea Plant Leaves Turning Yellow

Adjust Watering Schedule

If you suspect over or underwatering is causing your Calathea plant’s leaves to turn yellow, adjust your watering schedule accordingly. Make sure the soil is moist but not waterlogged and drain any excess water from the pot’s saucer.

Pest Control

If you notice signs of pest infestation such as webs or sticky residue on your plant, use a commercial insecticidal soap or neem oil spray to control the pests. Repeat treatment every two weeks until no more signs of infestation are visible.

Disease Prevention

To prevent fungal diseases, avoid getting water on your plant’s foliage when watering, ensure proper drainage of the soil, and increase airflow around your plant by using a fan or opening windows in the room.

Environmental Control

To avoid environmental stressors, keep your Calathea plant away from direct sunlight and cold drafts. Maintain a consistent temperature between 65-85°F (18-29°C) and humidity levels of 50% or higher. You can use a humidifier or place a tray filled with water near your plant to increase humidity levels.

FAQ

Q: Can I save my Calathea plant if its leaves have turned completely yellow?

A: If most of your Calathea plant’s leaves have turned completely yellow, it may be difficult to save it. However, if there are still some healthy leaves left on the plant, you can try adjusting its watering schedule or providing better care to promote new growth.

Q: How often should I water my Calathea plant?

A: The frequency of watering depends on various factors such as temperature, humidity levels, pot size, and soil type. In general, you should water your Calathea plant once a week or when the top inch of soil feels dry to the touch.

Q: How do I know if my Calathea plant needs more humidity?

A: If you notice browning leaf tips or edges or curling leaves on your Calathea plant, it may be a sign that it needs more humidity. You can increase humidity levels by misting the foliage with water or using a humidifier.

In conclusion, yellowing leaves in Calathea plants can be caused by various factors such as overwatering, pest infestations, disease, or environmental stress. By identifying the cause of yellowing leaves and providing proper care for your plant, you can help it recover and thrive.