Fertilizing Arborvitae: 5 Essential Steps to a Thicker, Healthier Hedge

Arborvitae (Thuja occidentalis), also known as cedars, are popular evergreen shrubs valued for their dense foliage, pyramidal shape, and easy maintenance. To ensure optimal growth and vitality, fertilizing arborvitae is crucial. Here's a comprehensive guide to help you provide the nutrients your arborvitae needs:

1. Understanding Arborvitae Fertilizing Needs

Arborvitae generally have moderate nutrient requirements. According to the University of Minnesota Extension, a balanced fertilizer with a ratio of 10-10-10 or 12-12-12 is suitable. The first number represents nitrogen, essential for leaf growth, the second number represents phosphorus, responsible for root development, and the third number represents potassium, crucial for overall plant health.

2. Choosing the Right Fertilizer

Several fertilizer options are available for arborvitae. Slow-release fertilizers, which release nutrients gradually over time, are recommended as they minimize leaching and prevent nutrient burn. Water-soluble fertilizers can also be used but should be applied more frequently. Organic fertilizers, such as compost or manure, can provide a natural source of nutrients.

3. Determining the Application Rate

The appropriate application rate depends on the fertilizer type and the size of the arborvitae. Slow-release fertilizers typically require less frequent application (e.g., every 3-6 months). For water-soluble fertilizers, follow the manufacturer's instructions carefully. As a general guideline, use approximately 1/2 cup of fertilizer per foot of height for established arborvitae.

4. Applying Fertilizer

For granular fertilizers, spread the fertilizer evenly around the base of the arborvitae, staying a few inches away from the trunk. For liquid fertilizers, mix the solution according to the manufacturer's instructions and apply it to the soil at the base of the plant. Water the arborvitae thoroughly after fertilizing to help distribute the nutrients.

5. Fertilizing Schedule

The optimal fertilizing schedule varies depending on the region and climate. In general, arborvitae should be fertilized once in early spring and again in early fall. This timing ensures a steady supply of nutrients for both growth and winter hardiness.

Benefits of Fertilizing Arborvitae

Regularly fertilizing arborvitae offers numerous benefits:

• Enhanced Growth: Provides essential nutrients for vigorous growth and development.
• Improved Foliage: Promotes thicker, lusher foliage with a vibrant green color.
• Increased Disease Resistance: Healthy, well-nourished arborvitae are more resistant to pests and diseases.
• Extended Lifespan: Proper fertilization prolongs the lifespan of arborvitae by supporting their overall health and vitality.

Conclusion

Fertilizing arborvitae is a simple yet critical step in maintaining a beautiful and healthy hedge. By understanding their nutrient needs, choosing the right fertilizer, applying it correctly, and following a consistent schedule, you can ensure your arborvitae thrive for years to come.