What can be detrimental to roses if applied excessively?

Excessive application of fertilizer is detrimental to roses because over-fertilization can lead to a number of issues. Roses require nutrients to grow, but too much fertilizer can disrupt the balance of nutrients in the soil. It can result in excessive foliage growth at the expense of blooms, making the plants leggy and less attractive. Furthermore, high nutrient levels can lead to salt accumulation in the soil, which can damage the roots and hinder the plant's ability to absorb water. This can manifest as leaf burn and even plant stress, compromising the overall health of the roses.

In contrast, while water is essential for rose health, both overwatering and underwatering can harm the plants. Pesticides, used judiciously, can protect roses from pests, but excessive applications might cause harm rather than help. Soil amendments, when applied correctly, enhance soil quality but can also create imbalances if used inappropriately. Therefore, understanding and managing fertilizer application is critical for the successful cultivation of roses.