Table of Contents
Mountain laurel (Kalmia latifolia) is a beautiful, evergreen shrub native to the eastern United States. Proper fertilization is essential for healthy growth, vibrant blooms, and overall plant vigor. Understanding the optimal seasonal times to apply fertilizer can help gardeners and landscapers achieve the best results.
Understanding Mountain Laurel’s Nutritional Needs
Mountain laurel prefers slightly acidic, well-drained soils rich in organic matter. It has specific nutrient requirements, especially during active growth periods. Providing the right nutrients at the right times promotes lush foliage and abundant flowers.
Spring Fertilizer Application
Spring is the primary season for fertilizing mountain laurel. As the plant emerges from dormancy, it requires nutrients to support new growth and flower development. Apply a balanced, acid-loving plant fertilizer in early spring, around March or April, once the soil has warmed.
Use a fertilizer formulated for acid-loving plants, such as azaleas or rhododendrons, with an NPK ratio like 10-8-10 or similar. Follow the manufacturer’s instructions for application rates to avoid over-fertilization.
Summer Fertilizer Practices
During summer, mountain laurel’s growth slows down, but supplemental feeding can support continued health and flowering. A light application of fertilizer can be made in early summer, typically June, if the plant shows signs of nutrient deficiency.
Avoid heavy fertilization during peak summer heat to prevent stress. Water the plant thoroughly after fertilizing to help nutrients penetrate the soil and reduce the risk of root burn.
Fall Fertilizer Timing
Fall is generally not the ideal time to fertilize mountain laurel. Applying fertilizer too late in the season can stimulate new growth that may not harden off before winter, increasing the risk of frost damage.
If necessary, a light feeding can be done in early fall, around September, with a fertilizer low in nitrogen to promote root growth and prepare the plant for winter dormancy.
Winter Considerations
Fertilizer application is generally not recommended during winter months when mountain laurel is dormant. Focus on protecting the plant from cold and ensuring the soil remains well-drained.
Additional Tips for Fertilizing Mountain Laurel
- Test soil pH regularly to maintain acidity levels between 5.0 and 6.0.
- Apply fertilizer evenly around the root zone, avoiding direct contact with the stem.
- Water thoroughly after fertilizing to facilitate nutrient absorption.
- Adjust fertilization based on plant health and growth response.
By timing fertilizer applications appropriately throughout the year, gardeners can ensure their mountain laurels remain healthy, vibrant, and full of beautiful blooms each season.