Planting Arborvitae Fertilizer: The 3-2-1 Guide

Planting arborvitae is a rewarding experience that can add beauty and privacy to your landscape. However, to ensure your arborvitae thrive and reach their full potential, it's essential to provide them with the right nutrients. This 3-2-1 guide will walk you through everything you need to know about fertilizing your arborvitae.

1. Choose the Right Fertilizer

The first step is to choose the right fertilizer for your arborvitae. Look for a balanced fertilizer that contains nitrogen, phosphorus, and potassium (NPK). The ideal NPK ratio for arborvitae is 10-10-10 or 12-6-6.

• Nitrogen promotes leaf growth and overall plant health.
• Phosphorus encourages root development and flowering.
• Potassium strengthens the plant's cell walls and helps it resist disease.

Avoid fertilizers with high levels of phosphorus, as too much phosphorus can lead to nutrient imbalances and stunted growth.

2. Fertilize at the Right Time

The best time to fertilize your arborvitae is in the spring and fall. Avoid fertilizing in the summer, as the heat can stress the plant and make it more susceptible to disease.

Spring: Fertilize in April or May when the soil has warmed and the plant is actively growing. This will give the arborvitae a boost of nutrients to promote new growth.

Fall: Fertilize in September or October after the plant has stopped growing for the season. This will help the arborvitae store nutrients for the winter and protect it from cold temperatures.

3. Apply the Right Amount

The amount of fertilizer you apply will depend on the size and age of your arborvitae. For a young plant, apply about 1/2 cup of fertilizer per plant. For a mature plant, apply 1-2 cups of fertilizer per plant.

• Broadcast application: Sprinkle the fertilizer evenly around the base of the plant, avoiding the trunk.
• Side-dressing: Dig a shallow trench around the plant and apply the fertilizer directly to the soil.

Water the plant thoroughly after fertilizing to help the nutrients reach the roots.

Additional Tips

• Use a slow-release fertilizer. This will provide a steady supply of nutrients over time, preventing nutrient burn.
• Don't over-fertilize. Too much fertilizer can damage the plant and burn the roots.
• Test your soil. This will help you determine the specific nutrient needs of your soil and avoid over-fertilizing.
• Mulch around your arborvitae. Mulch helps retain moisture, suppress weeds, and regulate soil temperature.

By following these tips, you can ensure your arborvitae receive the nutrients they need to thrive and bring beauty to your landscape for years to come.

FAQs

How often should I fertilize my arborvitae?

Twice a year, in the spring and fall.

What are the signs of nitrogen deficiency in arborvitae?

Yellowing or pale leaves, stunted growth, and poor root development.

What are the signs of phosphorus deficiency in arborvitae?

Purplish or reddish leaves, slow growth, and poor flowering.

What are the signs of potassium deficiency in arborvitae?

Dark green leaves with yellow edges, weak stems, and susceptibility to disease.

Can I use organic fertilizers on my arborvitae?

Yes, organic fertilizers such as compost or manure can provide slow-release nutrients for your arborvitae.

Key Points

• Choose a balanced fertilizer with a 10-10-10 or 12-6-6 NPK ratio.
• Fertilize in the spring and fall, avoiding the summer months.
• Apply 1/2 cup of fertilizer per young plant and 1-2 cups of fertilizer per mature plant.
• Water the plant thoroughly after fertilizing.
• Use a slow-release fertilizer, don't over-fertilize, and mulch around your arborvitae.