Yes, roses benefit from the addition of fertilizer when planting. Before planting, mix in a slow-release rose fertilizer or a balanced organic fertilizer into the soil. This will provide the rose with essential nutrients as it establishes its root system. Additionally, you can apply a balanced rose fertilizer throughout the growing season to promote healthy growth and abundant blooms. Be sure to follow the fertilizer's instructions for application rates and timing. With proper fertilization, you can support the overall health and vitality of your roses.