It is really important to fertilize your roses so they get their required nutrients. Roses are much like people in the things that they need to remain healthy. Just like people they need water and food (fertilizer).
Most types of roses have to be fertilized frequently to keep them growing at a fast pace. Use a fertilizer that is slow to release like fish emulsion or Osmocote at planting time. Be sure to follow the instructions on the label.
Avoid over fertilizing during the winter. Trying to promote new growth in the winter makes your roses more susceptible to damage.
Important Tip: Never fertilize plants that are heat- or water-stressed. Water-stressed plants that grow during a heat spell will suffer leaf and bud burn.
Wait for a steady temperature of approximately 70-80 degrees before fertilizing because your plants will get the most nutrients then. During the growing season, you can give the plants a water soluble fertilizer every two weeks.
