Many rosarians feed their roses every other week. Add organics and work them into the soil. Pre-mixed organics are available in garden centers and specialized vendors. Keep your roses well watered. Provide adequate water throughout this rapid growing period.
Water makes it all work - the organics, the food, the microbes.
Roses grown in our sandy soils need at least two inches of water each week. Mulch your roses with pine straw, pine bark or other materials. Pile on the mulch at least 3 to 4 inches thick, leaving the bud union and grafts exposed to the sunshine. Be on the lookout for spider mites. They arrive when the weather warms.