Living organisms, including buxus, require specific conditions to thrive and maintain their health. When these requirements are not met or stressors are encountered, the health of the organism can decline, and this decline can manifest in various ways, including changes in appearance like yellowing leaves. Understanding why your buxus are turning yellow and addressing the underlying causes will help you restore their vibrant green color and overall health.


1. Environmental Stress Factors

Buxus plants can turn yellow due to environmental stress factors such as:

  • Drought:
    Insufficient water can cause the leaves to lose their green color and turn yellow. This can happen during hot and dry spells, especially if the buxus is not watered regularly.
  • Overwatering:
    Excess water can also lead to yellowing leaves. Soggy soil deprives the roots of oxygen, causing them to rot and preventing the plant from absorbing nutrients and moisture.
  • Intense Sun Exposure:
    Buxus plants prefer partial shade. Direct exposure to intense sunlight can scorch the leaves, causing them to turn yellow or brown.
  • Poor Soil Conditions:
    The health of buxus plants depends on well-draining, fertile soil with a pH level between 6.5 and 7.5. Alkaline or acidic soil can cause nutrient deficiencies, leading to yellowing leaves.
  • 2. Pests and Diseases

    Buxus plants can be affected by various pests and diseases that can cause yellowing leaves, including:

  • Boxwood Blight:
    This fungal disease is caused by the fungus Cylindrocladium buxicola. It can cause leaves to turn yellow, brown, and eventually fall off.
  • Boxwood Psyllid:
    These sap-sucking insects feed on the leaves, causing them to turn yellow, curl inward, and eventualmente fall off.
  • Boxwood Mite:
    These tiny pests feed on the leaves, causing them to turn yellow and develop a stippled appearance.
  • 3. Nutrient Deficiencies

    Yellowing leaves in buxus plants can be a sign of nutrient deficiencies, particularly:

  • Nitrogen Deficiency:
    Nitrogen is essential for chlorophyll production, which gives plants their green color. A lack of nitrogen can cause the leaves to turn yellow.
  • Iron Deficiency:
    Iron is required for the production of chlorophyll. A deficiency can lead to yellowing leaves, particularly in the new growth.
  • Magnesium Deficiency:
    Magnesium is involved in various plant functions, including photosynthesis. A deficiency can cause yellowing leaves, especially between the veins.

    1. Proper Watering

    Maintain a consistent watering schedule, ensuring the soil remains moist but not waterlogged. Deep watering once a week is generally sufficient, but adjust the frequency based on weather conditions and soil type.

    2. Provide Adequate Sunlight

    Plant your buxus in a location that receives partial shade. Protect them from the intense afternoon sun by planting them near trees or structures that provide shade.

    3. Improve Soil Conditions

    Ensure the soil is well-draining and has a pH level between 6.5 and 7.5. Amend the soil with compost or other organic matter to improve its structure and fertility.

    4. Control Pests and Diseases

    Monitor your buxus plants for signs of pests and diseases. Apply appropriate treatments promptly to prevent the spread of infestations and infections.

    5. Address Nutrient Deficiencies

    Test the soil to determine the nutrient levels. Apply fertilizers according to the results of the soil test to correct any nutrient deficiencies.


    1. Why do some buxus leaves turn yellow while others remain green?
    This can be due to uneven watering, nutrient deficiencies, or pest infestations. Ensure consistent watering, address any nutrient deficiencies, and control pests to promote uniform growth and color.

    2. Is yellowing always a sign of problems in buxus?
    Not necessarily. Sometimes, older leaves may turn yellow and fall off as part of the natural growth cycle. However, persistent yellowing or yellowing of new leaves usually indicates an issue that needs to be addressed.

    3. How can I differentiate between nutrient deficiencies and environmental stress as the cause of yellowing leaves?
    Environmental stress often causes yellowing leaves throughout the plant, while nutrient deficiencies may cause yellowing in specific areas, such as between the veins or in the new growth.

    4. What are some organic remedies for treating yellowing buxus leaves?
    Organic remedies include using Epsom salt to address magnesium deficiency, applying iron chelates for iron deficiency, and spraying neem oil to control pests.

    5. When should I seek professional help for yellowing buxus leaves?
    If the yellowing persists despite your efforts to address common causes, it's advisable to consult a garden expert or arborist for a more in-depth diagnosis and tailored recommendations.



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