How to Fertilize Boxwoods: Essential Tips for Optimal Growth

How to Fertilize Boxwoods?

To fertilize boxwoods, it is best to use a slow-release, balanced fertilizer with a recommended formula of 10-6-4.

Apply the fertilizer around the entire diameter of root growth, following the package directions.

Avoid fertilizing in summer or winter, as well as over-fertilizing, as it can damage the shrub.

Consider the soil pH and make adjustments if necessary, with dolomitic lime for low pH and iron sulfate for high pH.

Water the boxwood thoroughly after applying fertilizer and additional applications may be needed every 4-6 weeks throughout the growing season.

Monitor the plant for signs of yellowing leaves, which may indicate a lack of nitrogen and require a different fertilizer.

Key Points:

  • Use a slow-release, balanced fertilizer with a 10-6-4 formula
  • Apply fertilizer around the entire diameter of root growth
  • Don’t fertilize in summer or winter, or over-fertilize, as it can damage the shrub
  • Consider soil pH and make adjustments if necessary
  • Water thoroughly after applying fertilizer
  • Monitor for yellowing leaves as a sign of nitrogen deficiency and adjust fertilizer as needed


Did You Know?

1. Boxwoods, when properly cared for, can grow at a surprisingly slow rate of approximately 1-2 inches per year. Patience is key when awaiting their lush green growth!

2. Did you know that boxwoods are actually part of the Buxaceae family, which includes roughly 70 species worldwide? These versatile evergreen shrubs are highly valued for their dense foliage and adaptability to various growing conditions.

3. In the medieval era, boxwood leaves were considered an effective remedy for multiple ailments. They were used to treat ailments such as headaches, asthma, and even toothaches! However, it’s important to consult a healthcare professional before using any medicinal plants.

4. Boxwood leaves are renowned for their durability and resistance to being eaten by deer. Unlike many other garden plants, boxwoods’ thick, leathery foliage makes them a less appealing option for foraging deer populations.

5. Boxwoods have a rich historical significance – they have been documented in Europe since ancient Roman times. The Romans used boxwood for various purposes, including crafting jewelry boxes, combs, and even musical instruments. The versatility and beauty of boxwood have been cherished for centuries.

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Timing of Fertilization for Boxwoods

Boxwoods are known for their resilience and ability to tolerate a wide range of growing conditions. However, to ensure optimal growth and health, it is important to follow a proper fertilization schedule.

  • Fertilizing should be done only a few times a year, preferably in the spring or late fall.
  • Fertilizing in the summer or winter should be avoided as it can disrupt the plant’s natural growth cycle.

By fertilizing during the appropriate seasons, you can provide the necessary nutrients to support the boxwood’s growth without causing any negative effects.

Recommended Fertilizer Formula for Boxwoods

When fertilizing boxwoods, it is highly recommended to use slow-release, balanced fertilizers. These fertilizers gradually release nutrients over an extended period, providing a steady supply of essential elements to the plant. A recommended formula for boxwoods is 10-6-4, representing the percentage of nitrogen (N), phosphorus (P), and potassium (K) in the fertilizer. If the boxwood is already healthy, organic alternatives such as aged manure or cottonseed meal can also be used. These natural fertilizers not only provide additional nutrients but also enhance the overall health of the plant.

  • Slow-release, balanced fertilizers are recommended for boxwoods.
  • The recommended formula is 10-6-4 (N-P-K).
  • Organic alternatives like aged manure or cottonseed meal can be used.
  • These natural fertilizers enhance the plant’s overall health.

Addressing Nitrogen Deficiency in Boxwoods

One common issue that boxwoods may face is a lack of nitrogen, which can result in yellowing of the shrub’s lower leaves. If your boxwood is exhibiting these symptoms, it is essential to address the nitrogen deficiency promptly. In such cases, urea or a balanced fertilizer with a higher nitrogen content should be used. These nitrogen-rich fertilizers will help rectify the deficiency and restore the vibrant green color to the shrub’s foliage. However, it is important to note that excessive use of nitrogen can be detrimental to the plant’s health. Therefore, it is crucial to follow the recommended application rates for the chosen fertilizer.

Soil pH Considerations in Boxwood Fertilization

The pH level of the soil plays a crucial role in nutrient availability to boxwoods.

  • If soil pH is below 6, it is considered acidic.
  • Addition of dolomitic lime can help raise the pH to a more favorable level.
  • If the pH is too high (indicating alkaline soil), iron sulfate can be added to lower the pH effectively.
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Maintaining the appropriate pH range facilitates efficient nutrient uptake by boxwoods, ensuring they receive the essential elements necessary for healthy growth.

It is recommended to conduct a soil test to determine the pH of the soil and make any required adjustments before fertilizing.

  • Soil pH below 6: Add dolomitic lime
  • Soil pH too high: Add iron sulfate

Soil testing is necessary to determine the pH level before fertilization.

Proper Application Technique for Boxwood Fertilizer

To ensure effective fertilization of boxwoods, it is crucial to follow proper application techniques. The fertilizer should be applied around the entire diameter of root growth, following the guidelines provided on the package. It is essential to avoid direct contact of the fertilizer with the roots or leaves to prevent any burning or damage to the plant. An organic slow-release fertilizer specifically formulated for shrubs is highly recommended, as it provides a steady release of nutrients. When applying the fertilizer, it should be evenly distributed around the base of the shrub, avoiding any concentration in one area. After application, thoroughly water the boxwood to help the nutrients penetrate into the soil and reach the plant’s roots.

Avoiding Over-Fertilization of Boxwoods

While fertilizing boxwoods is essential for their growth and vigor, it is crucial to avoid over-fertilization. Excessive amounts of fertilizer can lead to burning or damage to the shrub, and it can also negatively impact the surrounding environment. To prevent over-fertilization, always follow the recommended application rates and timing specified on the fertilizer packaging.

Additional fertilizer applications might be necessary every 4-6 weeks throughout the growing season, but it is important to monitor the plant’s response and adjust accordingly. If the boxwoods begin to show signs of yellowing or other issues, it may indicate a need for additional nutrients, but caution should be exercised to avoid excessive fertilization.

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By following these guidelines, you can nourish your boxwoods effectively and promote optimal growth and beauty in your garden.

Frequently Asked Questions

What is the best fertilizer to use on boxwoods?

One recommended fertilizer for boxwoods is a granular slow-release fertilizer with a balanced NPK ratio. These type of fertilizers provide a continuous supply of nutrients to the plants over an extended period, ensuring consistent growth and health. It is important to follow the instructions on the package for application rates specific to boxwoods, usually applied in early spring and again in late summer. Additionally, regular soil testing can help determine any specific nutrient deficiencies and guide the choice of fertilizer amendments for optimal boxwood growth.

How do you make boxwoods greener?

To enhance the vibrant green color of boxwoods, it is essential to focus on proper fertilization. To achieve this, you can utilize a foliar leaf fertilizer like TOPBUXUS® Boxwood Restore & Protect Mix. Apply the fertilizer by spraying it onto the leaves until they become slightly saturated. This method ensures that the boxwoods receive the necessary nutrients for robust growth and results in striking, lush green leaves. So, by regularly nourishing your boxwoods with a leaf fertilizer, you can maintain their vibrant and healthy appearance.

How do you make boxwoods healthy?

To ensure the health of boxwoods, it is crucial to provide them with proper drainage. These plants despise excessive moisture. Enhancing drainage can be achieved through the addition of organic matter to the soil or by planting them on a berm. Avoiding wet areas, such as those near downspouts or low-lying parts of the garden, is also essential for their well-being.

What fertilizer makes boxwoods green?

To achieve a vibrant green color in boxwoods, using a fertilizer containing Sulfur and/or Iron is highly recommended. These elements, found in a slow-release shrub & tree food, promote deep greening and are particularly beneficial when boxwoods are regularly pruned or sheared. Another option for fertilizer is a natural organic plant food, which also provides the necessary nutrients to enhance the green color of boxwoods.

References: 1, 2, 3, 4

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