All I can do is go over the usual reasons for not blooming. If none of them apply to you, have your soil tested. There may be a deficiency that routine fertilization doesn't correct or your pH may be way off. Speaking of fertilizers, look for an NPK ratio of 1-3-1. Too much nitrogen gives lush green growth but few flowers. Apply as directed. Inspect the plant closely. Do you see any buds forming? Are there aphids, tiny mites or thrips destroying these? Is the soil consistently moist, not wet. In average soil, roses need at least an inch of water weekly, 2 in unusually hot weather or if your soil is sandy. Check soil moisture using a meter or dig a few inches down with a small trowel. Frequent superficial watering will not reach the deeper roots. Does your plant receive at least 5 hours of direct, full-on sunlight each day? (more is better) Are you pruning annually in early spring as the leaf buds swell? A rose that isn't blooming is experiencing some type of stress. There is a small possibility that root stock is taking over. Do canes emerge from underground or below the graft? Root stock canes are called "blind shoots" because they don't flower. I hope you figure it out and your rose returns to blooming this fall.
