Plumbago is a popular flowering shrub, known for its abundant blue blooms and simple care. While resilient and low-maintenance, strategic fertilization can enhance their growth and flower production. Understanding proper fertilization helps plumbago thrive, leading to a vibrant display.
Why Fertilize Plumbago
Fertilizing plumbago provides essential nutrients that promote vigorous growth. These nutrients contribute to the intensity and abundance of its blue flowers, creating a striking visual impact. Regular feeding supports overall plant health, bolstering defenses against environmental stressors. Proper fertilization assists plumbago in recovering strength and vitality, especially after heavy flowering or pruning.
When to Fertilize Plumbago
Fertilize plumbago during its active growing season, from spring through early fall. An early spring application, as new growth emerges, provides a strong foundation for blooming. A second application in mid-summer sustains continuous flowering. Avoid fertilizing plumbago late in the growing season or during its dormancy to prevent new, tender growth susceptible to cold damage.
Choosing the Right Fertilizer
Selecting an appropriate fertilizer is important for plumbago’s health and blooming. A balanced NPK ratio, such as a 10-10-10, is recommended for general growth. A fertilizer with higher phosphorus, such as 8-10-10, encourages more prolific blooming.
Slow-release granular fertilizers offer a consistent supply of nutrients over time, reducing application frequency. Liquid feeds provide immediate nutrient availability, allowing for precise control and quicker response, though requiring more frequent application. Micronutrients are also beneficial for plant vigor. Organic options like compost or bone meal enrich the soil, enhancing its structure and nutrient retention.
How to Apply Plumbago Fertilizer
Proper application is important for effective, safe fertilization. Before applying, thoroughly water the soil around the plumbago to prevent root burn and aid nutrient absorption.
For granular fertilizers, sprinkle the recommended amount evenly around the plant’s drip line (the area beneath the outermost branches), not at the base. Gently work granules into the top inch or two of soil, then water again to help dissolve nutrients.
When using liquid fertilizers, dilute according to manufacturer’s instructions and apply to moist soil around the root zone. Always wear gloves and follow all product label safety precautions.
Addressing Fertilization Issues
Improper fertilization can lead to problems. Signs of over-fertilization include leaf burn (browning edges) or excessive leafy growth with reduced flowering. If over-fertilization occurs, flush the soil with plain water to help leach out excess nutrients. Conversely, under-fertilization or nutrient deficiencies may cause yellowing leaves, stunted growth, or poor flowering. Adjusting the fertilization schedule or switching blends can correct imbalances and restore vitality.