Arborvitae (Thuja occidentalis) is most often planted in rows in the garden as a privacy hedge. If planted singly and kept trimmed, this evergreen can also provide a focal point in your garden. When planting arborvitae, choose a sunny spot in your yard with loose, fertile soil. Once established, these conifers require little care and are resistant to most pests. During the first five years of growth, your arborvitae will benefit from an annual feeding. Providing the right amount of food at the right time of year is key to feeding your arborvitae.
Wait until late fall to fertilize your arborvitae. Fertilizing during the active growing season can stress your plant.
Measure the height of your arborvitae. This doesn't have to be an exact measurement, but should give you a rough estimate of the plant's height.
Calculate how much fertilizer to apply. You will need one-third of a pound of fertilizer for each foot of your arborvitae's height. For example, if your arborvitae is 5 feet tall, you will need 1-2/3 pounds of fertilizer.
Use the measuring cup to measure out the fertilizer (two cups is equal to one pound). Spread or sprinkle the fertilizer under the arborvitae. Keep the fertilizer from touching the trunk of the plant.
Use the trowel to work the fertilizer 2 to 4 inches into the soil around the arborvitae. Do not allow the fertilizer to come in contact with the roots or the trunk of your shrub. Once done, water your arborvitae well.
Things You Will Need
- Measuring tape
- General purpose or organic fertilizer
- 2-cup measuring cup
- The fertilizer you choose for your arborvitae should contain more nitrogen than other nutrients. The first number in the label should be double the second number (12-6-6 or 20-10-5, for example).
- Organic fertilizers that are high in nitrogen include compost and well-rotted manures.
- When using chemical fertilizers, do not apply more than recommended. More fertilizer will not help your plant grow better and can be detrimental to waterways.
- Arborvitae and other evergreens only need annual feedings for the first five years of growth. After this, if your arborvitae shows signs of nutrient deficiency, you should have your soil tested to determine the cause.
- Wear gloves and a face mask when handling chemical fertilizers.
- Follow all handling and storage guidelines that come with chemical fertilizers.
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