What factors determine the quantity of fertilizer applied on established ornamentals?

The quantity of fertilizer applied on established ornamentals is primarily determined by an analysis of the fertilizer, the area being fertilized, and the desired growth outcomes. Understanding the nutritional content of the fertilizer, such as its N-P-K ratio (nitrogen, phosphorus, potassium), allows for a tailored application that meets the specific needs of the plants being treated. Additionally, assessing the size of the area needing fertilization ensures that the appropriate amount is applied to avoid both deficiencies and excesses, which can harm the plants. Finally, considering the desired growth, whether it is promoting flowering, foliage, or overall health, dictates not only how much fertilizer is necessary but also which type of fertilizer is most appropriate for achieving those growth milestones.

While factors like weather conditions, size of the planting area, and types of ornamental species can influence fertilization practices, they do not directly determine the quantity of fertilizer required in the same comprehensive manner as the correct choice. Weather can affect when to fertilize, the size of the area can affect overall logistics, and different species may require different types of nutrients, but the systematic approach encapsulated in the correct answer remains crucial for effective fertilization strategies.