This guide provides a comprehensive guide to hydrangea fertilization in North Carolina. The best fertilizer for hydrangeas in North Carolina is one high in phosphorus and potassium but low in nitrogen, as nitrogen promotes leaf growth and can lead to weak plants. Hydrangeas are best planted in part shade, and small amounts of fertilizer throughout the growing season are best. A complete fertilizer, such as 10-10-10, should be applied at a rate of 2 cups per 100 square feet in March, May, and July.
In early spring, fertilize with Holly Tone or Rose Tone once a year, and then again during peak growing. Newer cultivars like ‘Quickfire’ and ‘Fire and Fire’ should be lightly dressed with fast-release fertilizer in March, May, and July, spreading it around the drip line of the branches. Hydrangeas should be fertilized twice a year, once in early spring and again in early summer. A slow-release 10-10-10 formulation is recommended when the plant is in a semi-shady location.
Planting hydrangeas in a semi-shady location is essential, as they may respond to changes in acidity. Fertilizing at least once a season in late winter or early spring is recommended. Hydrangeas need moist, well-drained soils, and during drought, they would benefit from a balanced fertilization schedule.
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