Planting Arborvitae Fertilizer: 10 Tips for Healthier, Thriving Trees

1. Why Fertilize Arborvitae?

Arborvitae, known for their dense foliage and evergreen nature, are popular landscaping choices. Providing them with the right nutrients through fertilization is crucial for maintaining their health and appearance. Fertilizing arborvitae:

• Promotes vigorous growth and lush foliage
• Enhances resistance to pests and diseases
• Extends the lifespan of the trees

2. Choosing the Right Fertilizer

Selecting the appropriate fertilizer for arborvitae depends on several factors:

• Soil type: Conduct a soil test to determine the pH level and nutrient content of your soil. This will guide you in choosing a fertilizer tailored to your specific needs.
• Tree age and size: Younger trees require less fertilizer than mature ones. Larger trees may benefit from a slow-release fertilizer that provides nutrients over an extended period.
• Time of year: Apply fertilizer in spring or fall when the tree is actively growing. Avoid fertilizing in the summer heat or winter dormancy.

3. Types of Fertilizer for Arborvitae

Various types of fertilizers are available for arborvitae:

• Granular: These fertilizers are applied to the soil surface and gradually release nutrients as they dissolve. They are a convenient option for larger planting areas.
• Liquid: Liquid fertilizers are diluted with water and applied directly to the soil or foliage. They provide a quick nutrient boost but may need to be applied more frequently.
• Slow-release: Slow-release fertilizers release nutrients over time, providing a consistent supply of nutrients to the roots. They are ideal for mature trees and low-maintenance landscapes.

4. How Much Fertilizer to Apply

The amount of fertilizer to apply depends on the type of fertilizer and the size of the tree. Follow the instructions on the fertilizer label carefully. General guidelines include:

• Young trees (under 5 feet tall): Apply about 1/4 cup of balanced fertilizer per tree.
• Mature trees (over 10 feet tall): Apply 1-2 pounds of fertilizer per tree.

5. How to Apply Fertilizer

• Granular fertilizers: Spread the granules evenly around the base of the tree, staying a few inches away from the trunk. Water the granules thoroughly.
• Liquid fertilizers: Dilute the liquid fertilizer according to the label instructions. Apply the diluted solution to the soil around the base of the tree.
• Slow-release fertilizers: Follow the application instructions on the fertilizer packaging. Slow-release fertilizers are typically applied once a year.

6. Tips for Fertilizing Arborvitae

• Water deeply: After fertilizing, water the trees thoroughly to help the nutrients reach the roots.
• Mulch around the tree: Applying a layer of mulch around the base of the tree helps retain moisture and suppress weeds.
• Avoid over-fertilizing: Excess fertilizer can harm arborvitae, leading to stunted growth or burned foliage. Follow the recommended application rates carefully.
• Monitor growth: Observe the trees after fertilizing to assess their response. If they show signs of nutrient deficiency, apply a small amount of additional fertilizer.

7. Common Fertilizers for Arborvitae

Some popular fertilizer options for arborvitae include:

• 10-10-10: A balanced fertilizer that provides equal amounts of nitrogen, phosphorus, and potassium.
• 12-6-6: A fertilizer with a higher concentration of nitrogen, which promotes foliage growth.
• 15-0-0: A nitrogen-rich fertilizer that is ideal for spring fertilization to stimulate new growth.
• 5-10-5: A slow-release fertilizer that provides a steady supply of nutrients throughout the growing season.

8. Frequency of Fertilization

Fertilize arborvitae once a year in spring or fall. If desired, you can also fertilize lightly in summer to provide a mid-season boost. Avoid fertilizing too frequently, as this can lead to fertilizer burn.

9. Signs of Nutrient Deficiencies

Observing your arborvitae can provide clues about their nutrient needs:

• Yellowing leaves: Nitrogen deficiency
• Purplish leaves: Phosphorus deficiency
• Stunted growth: Potassium deficiency
• Pale leaves: Iron deficiency
• Brown tips: Boron deficiency

10. Benefits of Fertilizing Arborvitae

Fertilizing arborvitae offers numerous benefits:

• Improved growth rate and vigor: Fertilizing provides the nutrients that arborvitae need to grow stronger and fuller.
• Enhanced resistance to pests and diseases: Healthy, well-nourished trees are better equipped to withstand pests and diseases.
• Extended lifespan: Proper fertilization can prolong the lifespan of arborvitae by supporting their overall health and resilience.
• Aesthetic appeal: Fertilized arborvitae have lush, green foliage that enhances their aesthetic appeal in the landscape.

Table 1: Arborvitae Fertilizer Types and Application Rates

Table 2: Common Nutrient Deficiencies and Symptoms

Table 3: Fertilization Schedule for Arborvitae

Table 4: Tips for Preventing Fertilizer Burn