Weak ,scraggly roses

i have 2 DA patio roses in pots.bThe plants are now in their 3rd year,but seem weak and spindly although have plenty of buds which droop when opened. I am not sure what is wrong with them. I fed them with granular slow releas rose food several weeks ago and give them a good watering every few days. I didn’t prune them this year. Could this be the problem?
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Which ones do you have?