Why Are the Leaves on My Citrus Trees Turning Yellow? Causes and Solutions

Common Causes of Yellowing Citrus Tree Leaves

There are several key factors that can cause yellowing leaves on citrus trees. Identifying the root cause will help you take the right steps to fix the problem. Let’s take a look at the most common causes of yellowing citrus tree leaves:

1. Nutrient Deficiencies (Magnesium, Nitrogen, Iron)

One of the primary reasons for yellowing citrus tree leaves is a **nutrient deficiency**. Citrus trees require specific nutrients, and when they are not getting enough of the right ones, their leaves can begin to yellow.

• Magnesium Deficiency: Magnesium is a vital nutrient for citrus trees. It helps with photosynthesis and gives leaves their green colour. A lack of magnesium results in **interveinal chlorosis**, where the area between the veins turns yellow. Our **Citrus Fertiliser Blend** contains magnesium to correct this issue.
• Nitrogen Deficiency: A nitrogen deficiency will cause older leaves to yellow, particularly in the lower part of the tree. Nitrogen is essential for producing chlorophyll and promoting healthy growth. Our fertiliser has a balanced nitrogen level that prevents excess leaf growth while still supporting fruit and flower production.
• Iron Deficiency: Iron is essential for chlorophyll production, and a deficiency can result in **yellowing between veins**, especially in young leaves. Citrus trees that suffer from iron deficiency may need a supplement that includes chelated iron. Our fertiliser blend helps address this micronutrient need.

2. Watering Issues: Overwatering or Underwatering

Citrus trees are sensitive to watering habits. Both **overwatering** and **underwatering** can cause stress, leading to yellowing leaves.

• Overwatering: Overwatering is one of the most common causes of yellowing citrus leaves. It can suffocate the roots, preventing them from absorbing oxygen and nutrients. This often leads to root rot. To fix this, ensure the soil is well-draining and allow the soil to dry out between waterings.
• Underwatering: Citrus trees need regular watering, especially during the warmer months. If the soil becomes too dry, the tree will experience stress, leading to yellow leaves and poor fruit development. Deep watering is essential to ensure the roots get enough moisture.

3. Environmental Stress

Environmental factors like **extreme temperatures**, **dry winds**, or **poor sunlight** can cause citrus trees to shed their leaves or turn them yellow.

• Temperature Stress: Citrus trees are sensitive to cold temperatures. If temperatures drop below 10°C (50°F), the leaves may turn yellow, especially if the tree is not properly sheltered.
• Sunlight Issues: Citrus trees need plenty of sunlight to thrive. Lack of sunlight can cause yellow leaves and reduced fruit production. Ensure your tree gets **6–8 hours of direct sunlight** daily.