Wax myrtle (Myrica cerifera) is a versatile plant known for its adaptability in various landscapes. While generally low-maintenance, understanding its specific fertilization needs can promote its health and growth. Providing the right nutrients ensures these plants thrive, whether as hedges, screens, or standalone specimens.
Understanding Wax Myrtle Nutrient Requirements
Wax myrtles are adaptable plants that flourish with minimal intervention. A distinguishing characteristic of these plants is their ability to form a symbiotic relationship with specific soil microorganisms, which allows them to fix atmospheric nitrogen directly into the soil. This process reduces their reliance on external nitrogen fertilizers. Fertilization is often unnecessary for established plants in rich soil. However, in instances of very poor soil, new plantings, or when plants show signs of stress, targeted fertilization can provide beneficial support.
Choosing the Right Fertilizer
When considering fertilizer for wax myrtles, the type of product chosen makes a difference due to their nitrogen-fixing capabilities. A balanced fertilizer, such as a 10-10-10 NPK ratio, is often suitable if supplemental nutrients are needed. Some formulations with a slightly higher nitrogen content, like a 10-6-4 ratio, can also be used to encourage vigorous growth. Slow-release granular fertilizers are a good choice as they provide a steady supply of nutrients over time, minimizing the risk of nutrient overload. Additionally, incorporating organic materials like well-rotted compost or manure can enhance soil quality and gently release nutrients.
When and How to Fertilize
The best time to fertilize wax myrtles is in early spring, before new growth emerges. This timing allows the plant to readily absorb nutrients as it enters its active growth phase. For granular fertilizers, spread the product evenly around the plant’s drip line (the area beneath the outermost branches). After spreading, water the area thoroughly to help the fertilizer dissolve and move into the soil where roots can access it. When using liquid fertilizers, dilute the concentrate according to manufacturer’s instructions and apply as a soil drench around the plant’s base, avoiding direct contact with foliage or trunk to prevent burn.
Addressing Fertilization Concerns
Improper fertilization can lead to several issues for wax myrtles. Over-fertilization, often characterized by “fertilizer burn,” may manifest as brown or scorched leaf margins and tips, or result in rapid, leggy growth lacking strength, or stunted growth. A visible crust of fertilizer salts on the soil surface can also indicate over-application. Conversely, under-fertilization or specific nutrient deficiencies can cause yellowing leaves, stunted development, or a general decline in plant vigor; for instance, yellowing leaves with green veins may signal an iron deficiency, especially in alkaline soils. A soil test is a practical first step to assess nutrient levels and pH, guiding precise fertilization and preventing these problems.