I purchased 10 knockout roses nearly 2 years ago. Planted about 20' in from a narrow 2 lane private road (very light traffic). I created a bed used landscape fabric, and small white marble stones as a mulch bordered by decorative landscape blocks in front with a white picket fence behind. I fertilized them once with a fertilizer designed for roses. I would expect by now (?) the bushes would have filled in nicely. Wrong....they are alive but they haven't grown much larger than the day I bought them. What do you suggest? Thank you.